Glock 43 vs Sig P365

A Detailed Review

Sig’s Fat Mag vs Glock’s Single Stack 

The Glock 43 vs Sig P365 are two of the most popular concealed carry pistols on the market. Which one do you have?

The Sig P365 is a new category of pistol that came out of the left field.Glock 43 vs Sig P365 Side by Side Comparison

The Glock 43 is so popular, Glock has sold over a million of them in under 3 years.

These pistols are destined for an epic rivalry.

  • They’re both about the same size. 
  • The Glock 43 dimensions hold 6+1 rounds of 9mm and provide Glock loyalists with an easy to conceal package. 
  • The Sig P365 dimensions hold 10+1 rounds of 9mm in an impossibly small pistol size for the amount of firepower it holds.

I’ll explain how Sig accomplished their capacity miracle. 

I’ll also delve into Glock’s loyal fanbase.

If you could only have one, which would it be?

The Sig P365 Mystery Solved: How They Did It?

It’s either low capacity or bigger gun…right? Not anymore.

Sig Sauer engineers performed a miracle. 

They created a pistol the size of a single stack subcompact pistol with the capacity of a double-stack subcompact pistol.

The Sig P365 really is very close in size and weight of the Glock 43. Yet it really has the capacity of the Glock 26! 

They really did it. Glock 43 vs Sig P365 Barrel Length Comparison

Sig Sauer helped Concealed Carriers all over the country realize that dreams really do come true. You can leave your house with a comfortably small handgun without feeling inadequately armed.

With the extended mag, you have 12+1 rounds on tap of 9mm. That’s adequate protection!

Before I explain how Sig accomplished the impossible, let’s open up the full picture of just how groundbreaking the Sig P365 is and what the landscape looked like before it’s epic entry.

Subcompact Pistol Evolution

The pistols that changed the Concealed Carry landscape 20 years ago were double stack subcompact pistols. 

Companies like Glock were chopping their double-stack pistols down in size and capacity to accommodate Concealed Carry. It proved to be very successful for most handgun companies.

These new pistols packed up to 10 rounds of ammo and were between 1&1/4” and 1&1/2” thick. And your pinky was usually left dangling in the wind. 

Most new guns sold to American civilians were limited to a 10 round capacity.

This new “reasonable” ammo count was due to evil politicians such as liberal extraordinaire, Dianne Feinstein. 

Because the ammo count was limited to 10 rounds, engineers started designing much smaller pistols (why tote more pistol than you can utilize?). Thankfully the law expired in 2004 but the smaller pistol trend stuck.

A few years back, pistol engineers started building even smaller single-stack subcompact pistols to further accommodate Concealed Carry. These pistols usually had a capacity of 7-8 rounds of 9mm. 

They were about the same size as double-stack subcompact pistols; only thinner. They were usually about an inch thick.

While most Concealed Carriers would prefer 10 rounds over 7, many decided to carry the smaller single stack pistols because they were just plain easier to conceal.

We had no choice, right?

If we wanted to carry a smaller pistol, we had to give up a few rounds.

Well, we have a choice now. We can have decent capacity and single stack size in one package: The Sig P365.

So how did Sig Sauer do what nobody else even attempted?

How Sig Sauer Did It

Let’s break it down.

  • Slightly modified Double Stack Magazine
  • Mag has tapered aggressively at the top
  • Really thin mag well walls
  • 10th round is crammed in tight

It really is that simple. 

That’s why I’m adamant that other pistol manufacturers will follow suit.

Let’s break out the measuring stick.

The Glock 43 is 22 millimeters thick at the slide.

The Sig P365 is 22 millimeters thick at the slide.Glock 43 vs Sig P365 Slide Width Comparison

So far so good.

The bottom of the Glock 43 mag well is 22 millimeters.

The bottom of the Sig P365 mag well is 24 millimeters.Glock 43 vs Sig P365 Slim Size Comparison

(Some other Single Stack pistols are 24 millimeters thick too.)

Both mag well walls of the Glock 43 added together = 5.5 mm

Both mag well walls of the Sig P365 added together = 4.0 mm

(Some Single Stack pistol mag well walls add up to 7mm)

The Sig P365 now has 3.5 mm to play with.

Guess how much wider the Sig P365 mag is than the Glock 43 mag? If you guessed 3.5 mm, you’re a genius!

Sig Sauer has another advantage. They don’t coat their mags in plastic-like Glock does. Glock has less space inside their magazines because the walls of the magazine itself are thicker.

Which do you think customers will care more about?

  1. Thicker mag well walls and magazine walls.
  2. More capacity.

Based on the enthusiastic reception the Sig P365 has received, I think it’s safe to say most people haven’t even thought about how thick a magazine’s walls should be.

People care about capacity, concealment, and how well it shoots above all else. The Sig P365 checks all 3 boxes.

The Sig P365 shoots well because of its great trigger, sights, and ergonomics.

So far, it sounds like the perfect Concealed Carry pistol.

There are over a million people who would claim the same for the Glock 43 though.

Let’s take a closer look at the Glock 43 to find out why it’s been selling like hotcakes since its introduction. 

The Glock 43 Phenomenon: Fanatical Popularity Is Justified

Glock 43 vs Sig P365 Barrel Length Comparison

What Does Glock Do Better Than Anyone Else?

Above all else, people trust a Glock to go bang; no matter what. Glock doesn’t sell pistols. Glock sells peace of mind.

Glock’s reliability is never questioned.

Glock makes utilitarian tools that just plain work. They are aren’t pretty or fancy. They don’t have thumb safeties. Simply pull the pistol out of the Glock 43 holster and pull the trigger. 

It’s incredibly simple to operate.

Glock makes self-defense tools first and foremost. The Glock 43 is no exception. It shares the same design that police and military have used for decades.

Thirty years ago, Glock pistols were called unsafe because they used a striker-fired trigger with a 5 lb. trigger and no manual safeties. Fast forward a few decades and most pistol manufacturers make pistols this way today. 

Glock’s foresight was obviously spot on.

While Glock’s overall design hasn’t changed that much over the decades, Glock has improved reliability, accuracy, and ergonomics through five generations of designs.

Glock took everything that makes a Glock special and crammed it into a tiny gun that’s easy to conceal and shoots well. The Glock 43 makes concealing a Glock pistol easier than ever before. (So does the Glock 42 but that’s a story for another day).

The Glock 43 basically has the same trigger, sights, and grip angle as its bigger brethren. Heck, it even has the same design language. It sports the familiar texture and front strap (no finger grooves) from the latest Gen 5 Glock 19 and Glock 26.

Glock was pelted with requests for years from their loyal fanbase to bring Glock’s interpretation of a Single Stack Nine to the market. People who are fanatical about Glock’s pistols up until this point were forced to carry other pistol brands when their Glock 26 wasn’t small enough.

Many people who carry Glock prefer to run only Glock pistols. They all operate exactly the same. They have (mostly) the same trigger feel and grip angle as well. Many of them even have interchangeable parts and magazines.

Plus, they have that militaristic aura that emanates confidence. Glock pistols give you the feeling that you don’t have to question it’s reliability. It’s a Glock.

Both of these pistols are looking great so far.  Let’s break out the magnifying glass and line them up side by side in a Glock 43 vs Sig P365 breakdown.

Glock 43 vs Sig 365: Compare And Contrast

Glock 43 vs Sig P365 Specs Side by Side Comparison

While there are many similarities between this Glock 43 vs Sig P365 comparison, there are differences aplenty to point out.

For starters…

10+1 is obviously desirable over 6+1. 

Glock 43 vs Sig P365 Mag Capacity Comparison

If you’re confronted with more than 1 attacker, 7 bullets is a frighteningly small number of bullets to protect your life with.

Consider that in most police shootouts half of the bullets miss the intended target. Also, consider most bad guys take 2-3 bullets to stop.

Those stats make a Glock 43 look adequate to stop ONE attacker in a worst-case scenario. I like to base my survivor scenarios on worst-case scenarios (that’s why I carry a backup pistol).

If you have 11 rounds of 9mm on tap, you’re statistically barely able to repel two attackers.

Did you know that almost half of the scenarios that require a self-defense response involve two or more attackers? 

Dirtbags like to run in packs.

The Sig P365 absolutely dominates all other pistols in this size class of pistols when it comes to capacity.

Glock 43 vs Sig P365 Extended Magazines Holster Comparison

Capacity is the single biggest draw to the Sig P365.

Glock 43 vs Sig 365: Sights

Glock gives the G43 the standard polymer Glock sights. 

Nobody loves Glock’s sights – although most will tolerate them enough to not bother upgrading them.

Sig gives the P365 amazing (steel) night sights. It comes standard with XRAY3 Day/Night sights. Not only are these very high-quality sights, but they also perform great in bright or dark settings.

Glock 43 vs Sig P365 Height Comparison

The XRAY3 sights do not require a light source to charge them. They will glow even if they’ve been sitting in a gun safe for 2 years.

These are the type of high-quality sights that many Glock owners will add to their pistol. The fact that they come standard on the Sig P365 is yet another explanation to the Sig P365’s immediate popularity.

Glock 43 vs Sig 365: Ergonomics

Both are great! 

The Glock 43 dimensions have the steeper grip angle that they’re known for. Neither grip angle is necessarily better than the other. But of course, you’ll shoot the Glock 43 better if you’re used to shooting Glock pistols.

If you’re not used to Glock’s steeper grip angle, you can still shoot the Glock 43 proficiently. It’ll just take some practice to get used to it. The Sig P365 has the usual grip angle that you’ll see on most pistols.

Both pistols feel great in the hand. Of course, this is a very subjective opinion.

It’s always important to ensure a pistol “feels right” in your hand before purchasing it.

Sometimes you’ll pick up a pistol and it feels like the pistol designer consulted with you before finalizing the design.

Other times you’ll pick up a pistol and sneer as you think about how disgusting it feels in your hand.

You’ll really want to pick them both up and see how they feel to you in order to subjectively judge their ergonomics.

I personally find that both of them fit my hands great. The Sig P365 fits my hand just slightly better but only if I handle them one right after the other. 

If I pick them up on separate occasions, I’ll swear that’s the one that feels best in my hand.

If you want to compare the Sig to a slightly bigger gun, check out our Taurus G3C vs Sig P365 comparison.

Glock 43 vs Sig 365: Fit & Finish

Not to sound like a broken record but… both are great.

However, the Sig P365 seems to be a little higher quality than pretty much any compact polymer pistol on the market.

Sig has a knack for creating pistols that ooze quality.

That’s not to say that the Glock 43 doesn’t feel like a quality handgun. It most certainly does.

The Sig just feels a little higher quality. It’s more closely comparable to Springfield’s Hellcat. You can read the full Springfield Hellcat vs Sig P365 comparison for more details.

Glock 43 vs Sig 365: Trigger

The Glock 43 has a typical Glock trigger. It’s not amazing. However, it does have a great reset. The reset is easy to feel and hear.

The Glock 43 dimensions make the trigger feel spongy while it’s moving toward the break. But once you hit the wall right before the break, you’re golden. It’s a pretty clean break.

The Sig P365 has an amazing trigger right out of the box. It has very little creep (you don’t get that spongy feeling that’s on the Glock 43). The break is very clean and nice. The reset is just as good as Glock’s.

The Sig trumps the Glock in the trigger department.

Glock 43 vs Sig 365: Features

The Sig wins this department too, but it’ll cost you. The sig does have more features but it’s more expensive.

But it very important to point something out in our Glock 43 vs Sig P365 comparison.

If you pay to upgrade your Glock 43, it’ll cost more than the Sig P365.

The night sights alone will set you back about $100 to add to the Glock 43. They’re standard on the Sig.

Let’s look at some other features you’ll get on the Sig P365 that are missing on the Glock 43.

The Sig P365 comes with front slide serrations (useful for press checking). The Glock 43 has the usual boring Glock slide.

The Sig P365 has a factory optional extended mag that ups the ammo count to 12+1.

The Glock 43 has a few aftermarket options for extended mags. However, they don’t quite look like they belong on the pistol.

If you want an upgraded Glock 43 and you’re ok with a slightly bigger handgun, you’d be wise to check out the Glock 43X.

You can read a full Glock 43X vs Glock 43 comparison on our blog.

Glock 43 vs Sig 365: Capacity

Normally, you wouldn’t see capacity in the “Features” section of a gun writeup. However, nothing is normal about the Sig P365. 

The Sig P365’s #1 feature is its amazing capacity.

Glock 43 vs Sig P365 Mag Options Comparison

With the extended magazine, the Sig P365 has more rounds than the Glock 43 or even the Glock 26. In fact, it’s only 3 rounds short of the venerable Glock 19!

The Sig P365 is definitely more feature-rich than the Glock 43.

Glock 43 vs Sig 365: Ease of Concealment

They are both pretty darn close in size and weight. Although the Sig P365 is just a touch shorter.

The Sig P365 will be just a bit heavier fully loaded because it holds more bullets. But if you want it to weigh less than the Glock 43, you could always load the mag halfway (said no one ever). Your Sig’s slightly heavier loaded weight won’t be noticed in great Sig P365 Holsters though.

The Glock 43 and Sig P365 are incredibly easy to conceal. You can still conceal their big brothers though: the Sig P365XL vs Glock 43X debate is still raging on as well.

However, it’s hard to find a gun as concealable as the G43 or P365.


Get the Sig P365 unless you’re a Glock fan.

The Glock 43 is an amazing pistol for Concealed Carry. Especially for Glock fans.

It’s small, reliable, and a great shooter. If you’re used to Glock’s, it’s a no-brainer. The Glock 43 has the same feel as it’s bigger brethren.

The Glock 43 is also every bit as reliable as its Glock heritage suggests.

However, if you’re not stuck on Glocks, the Sig is hands down the better choice here. 

You can also read our full Sig P365 review if you want to keep reading about how awesome the P365 is.

Almost twice the ammo in a smaller package…nuff said!

The Sig P365 also has a better trigger and sights. It does cost a little more but the upgrades are more than worth the extra $50 – $100.

So, depending on the Glock 43 vs Sig P365 debate, which do you have or what to purchase soon? If you pick one up, be sure to check out our durable and modular Kydex holsters that are adjustable for multiple ride heights and cant angles.

0/5 (0 Reviews)
0/5 (0 Reviews)
25 replies
  1. David-NF
    David-NF says:

    The fact that they labeled the 9rd ETS mag as an 8rd magazine just goes to show how Impossible they are to load from the factory. Had to heavily modify the one’s I bought for a friend just to be able to hold 9 rounds. They wouldn’t even hold 7 or 8 out of the box. They do function perfectly since modifying them though.

  2. BigJerm
    BigJerm says:

    Not a single mention of the M&P Shield? Add a Magguts kit to your Shield and you’re in business, with 9+1. One round short of the P365 but MUCH MUCH better recoil impulse, ergonomics, and track record. I hate the G43 because it gives me nasty slide bite, and there’s no beavertail options like on the larger Glocks. Hate the 365 because the grip is so skinny, I can’t even get my support hand to touch the gun, it’s literally just hugging my other hand. The M&P Shield has a big enough grip circumference, as well as super aggressive texturing, and a great 1911 grip angle. It’s easier to draw, quicker to shoot, and lighter recoiling than either of the two guns mentioned here.

  3. George F.
    George F. says:

    trying to multitask here and didn’t get my sentence finished lol.

    *** One or the other will be the winner!! Can’t go wrong with either of them.

  4. George F.
    George F. says:

    First off, I am a Glock fanboy! I have both the Sig P365 & the Glock 43x. I can’t seem to let go of either of them. I wanted to hate the Sig but it outshines my 43x in sights, trigger, capacity, conceals better, and just feels more natural in my hand. The 43x has a longer barrel for better velocity and sight radius even if it is minimal. The 43x to me, seems to fit differently or at least a better poa than my original 43 did. I guess I will keep them both and rid myself of the first one that breaks or malfunctions. If I had to absolutely pick on over the other…. ugh… grrr… I’d have to keep the SIG…

    To others on the fence and only wanting one or the other, handle them both and shoot both of them. One or the other will

  5. Clinger Holsters Team
    Clinger Holsters Team says:

    Hi Steve,

    Thank you for the comment. We will get a Comfort Cling model out that fits it this year. We promise!

  6. Steve
    Steve says:

    For concealed carry, the Glock 43, nor any other pistol can match the P365 for size and round count. Add great sights, trigger and texture and the P365 is unmatched. What I do NOT UNDERSTAND is why Clinger takes FOREVER to make a soft holster for a gun as popular as the P365!? Come on guys, you losing sales daily. How long can it take?

  7. Paul
    Paul says:

    I’d rather have my Sig 320 Sub-compact than either the 365 or any Glock. The 320 SC holds 12+1 of 9mm all the time. Weighs just a mere 6 more ounces, has a slightly bigger grip frame but I like that, it fits my hand much better than the 365. With night sights, an APEX trigger and Obsidian Arms “pinky rest” base pads it’s a better carry gun than either one of the guns in this article. Oh … and it costs less.

  8. Flyall
    Flyall says:

    I own many guns and bought a M&P 9 Shield. Can’t believe how many times it has jammed and locked open. Sorry I just don’t trust any auto except the glock. When I first saw a glock in the 70″s I asked the gun store owner why he liked the glock. He took it out of his holster and threw it over his shoulder and it landed on the floor. He said that is why I carry a glock. Glocks always work and that is the point of self defense. I have many glocks and love them all.


    I had the glock 43 and liked it however once I got my signature 365 there was no looking easy to carry, very easy to get on target with those awesome sights sights sig
    all the way

  10. Hiram Davis
    Hiram Davis says:

    I bought the 365 a couple of months ago and have taken it too the range 3 times. Why? Other than the obvious; training, it is FUN.
    I’ve never owned a Glock, so can’t make a comparison. But I do love my 365.

  11. Tom
    Tom says:

    For me, guns are tools. I want something that will do the job when needed.

    The G43 is something I carry when my G26 is a bit too obvious. I normally carry a G19 & a G26 (NY reload) plus a spare 17 round mag. Works with either.

    As far as the G43/P365 debate, the G26 isn’t too far off the mark. In fact, the G26 is not as tall as the P365. So, as far as I’m concerned, the G26 is close enough in all the categories AND it works with big Glock mags. Can’t say that for the Sig. It doesn’t work with P320 mags, or anything else that Sig makes.

    Keeping the argument to the G43 and P365, I just want something that works. Supposedly the newer (post June or July) P365s work really well now. Maybe I’ll look into getting one next year. But for now, the G43 gets the nod because it goes bang every time. Always has. And I’ll be damned if I’ll burn through 1,200 rounds of ammo just to prove something works. Who knows, maybe at 1,201 it will stop working. I just don’t want that doubt hanging over me.

  12. Ted Leonard
    Ted Leonard says:

    In 2 separate classes I attended the only pistol to break down was a SIG 365. Not just a malfunction but stopped working, could not be forced to fire by several different people. Something about send it in for the fix. The article is correct, Glocks do get me on new sights, extended mag release, extended slide stops, I do not change the triggers.

  13. Jim Hurley
    Jim Hurley says:

    Sig Sauer engineers did not preform a miracle, they more than likley copied the Kel-Tec P11 which was first manufactured in 1995. The P11 has 10+1 or 12+1 capacity and the 12+1 magazine doesn’t extend below the grip. The P11 is lighter, shorter, same height and 1mm wider. Barrel length is the same. It’s also about $200 cheaper. If the trigger pull was lighter it would be a very good gun. I’ve carried one for 11 or 12 years. I’m getting older and my hand strength is declining so the long heavy pull makes it hard for me to shoot accurately.

  14. Dana
    Dana says:

    I know you are comparing Glock 43 to SIG P365, but I moved from an S&W M&P Shield Compact.40 to the SIG P365. SIG is better in every way with the exception that you give up some knockdown power going from the .40 to the 9mm.
    The SIG feels better in my hand, with the great sights I’m more accurate, and it’s much more concealable with either IWB or pocket carry. Add that it’s 12+1 instead of 7+1 and the SIG P365 is my solid CCW favorite. The M&P Shield is likely gonna be traded for a higher capacity .40 to keep in my vehicle.

  15. Herb
    Herb says:

    I was a Glock user/devotee since around 1986 or 7 when the Sheriff’s Office switched from the revolver and we did a 500 round familiarization course. I had owned a Sig P226 and sold it. When Sig came out with the P320, I tried it. My Glocks are now in the safe. I bought the G43 and liked the concept but recoil was not comfortable and of course, all Glocks have terrible triggers that are only made tolerable with aftermarket triggers installed. I tried the P365 when it came to my area, and bought one. The 365 is easier to shoot; it is much more accurate; it carries much more ammunition; it has noticeably less recoil, and it costs less since you don’t have to do anything to it other than shoot it.

  16. Jay
    Jay says:

    Huge Glock fan here for all of the usually quoted reasons. My cool weather (when the clothing is heavier) EDC is the Glock 19 concealed in an OWB holster. My warmer weather (which is most of the year here in central Texas) EDC is the Sig P365 with extended mag AIWB. The Sig P365 replaced the Glock 43. I’ve never looked back. Your mileage may vary.

  17. 1stfreedom
    1stfreedom says:

    I own Glocks and SIGs. I carry SIGs but not Glocks. I’ve carried both in the past, in the military and as a peace officer, and I wish the SIG P365 had been around in those days. The P365 trigger has very little creep, a light pull and a great reset. The Glock has a Glock trigger, damnable “safety” tongue and all.

    I’ve only fired my P365 about 450 rounds and a variety of bullet types, and have experienced no failures or hiccups at all.

    I trust the P365 to protect loved ones and self!

  18. th5 Star
    th5 Star says:

    I’ll take a Glock over any piece of crap that Sig sells anyday. I’ve had a sig jam on me once during practice.

    I’ve never had a Glock jam on me. Ever.

  19. Ed
    Ed says:

    I tried hard to like the Glock 43. I just can’t get past having only 7 rounds of 9mm on me. That’s why I usually carry the Glock 26 or 19.

    I’ve seen a youtube video with some marines sitting around a table showing off their daily carry. They all whip out these Glock 43 pistols and a little folding pocket knife.

    Well I’m not a marine. I need overwhelming firepower if I encounter a violent situation. I can’t guarantee how accurate I’ll be in a firefight because I’ve never been in one. I don’t trust being able to land more than half my shots in a high stress situation.

    I’ve seen other youtube videos where gas station robberies kick off shootouts. Usually after the drama is over, 1 or 2 shots (if any) actually hit somebody.

    I practice and all that but I feel much more comfortable carrying 10-15 rounds on me. If I was a marine, maybe I’d feel comfortable enough to carry the Glock 43.

    All that being said, I’ll definitely look into the Sig P365. 12+1 rounds seems like a much more appropriate level of firepower to protect yourself with.

  20. Charles J
    Charles J says:

    I actually think the Glock 43 is a better pistol. However, I carry the Sig more often simply because it’s a bit shorter. That little bit of difference makes it much easier for me to carry it in AIWB position.

    I think the Glock is better because I can shoot it better at the range. I’m not sure why but my shots are wilder coming out of the Sig. The glock 43 just fits my hand better I suppose.

    Also, I know everyone says the glock trigger sucks but I can consistently do better at the range with glocks. I personally love glock’s stock trigger.

    I wish Glock would make a 9mm just a bit smaller, I’d be all over it.

  21. john Q
    john Q says:

    I personally loved the Glock 43. “Loved” – past tense. Once I got a Sig P365 I very quickly got rid of the 43. Everything about it is better. EVERYTHING. I can group my shots closer, the sights ROCK, and the texture on the grip is 10x better.

  22. theo64oh
    theo64oh says:

    Glocks suck. I can’t get past the trigger and the 2×4 ergonomics. Even the Glock 43’s slimmer grip feels like a board instead of a grip.

    And what possesses a modern gun company to put plastic sights on a gun that costs almost 500 bucks?

Leave a Reply

Want to join the discussion?
Feel free to contribute!

Leave a Reply

Your email address will not be published. Required fields are marked *