Glock 43 vs. Sig Sauer P365: The Battle of the Best for Concealed Carry

Before I get started, I'll be upfront about a couple things.

XTech Tactical sponsors FAST, and I've known Jeremy from XTech for close to a decade. I've also been fortunate enough to beta test many of XTech's products over the years as they've evolved through multiple design revisions.

That relationship gives me a unique perspective because I've had the opportunity to see these products long before they ever reached the market. More importantly, I've had the chance to run them hard in competition, training, and testing across a variety of firearms.

After spending years with these magazines and extensions, there are a few reasons they've become some of my favorite Glock-compatible magazine upgrades available today.

What First Got My Attention

Like most shooters, I was initially interested in capacity.

The particular magazines featured in my video are XTech's Glock-compatible magazines equipped with their extension system, bringing total capacity up to 22 rounds.

Extra capacity is always useful, whether you're shooting matches, training, or simply spending a day at the range.

What kept my attention, however, wasn't the extra rounds.

Over the years I've tested a lot of magazine extensions from a lot of manufacturers. Some work well. Some work most of the time. Others look great on paper but quickly reveal weaknesses once you start putting serious round counts through them.

The XTech design solved one of the biggest issues I've seen repeatedly with magazine extensions.

The Hidden Problem Most Shooters Never See

Most shooters don't spend much time thinking about what happens inside a magazine.

As long as rounds feed correctly, the internal design usually goes unnoticed.

One of the biggest challenges with magazine extensions is the transition point between the factory magazine body and the extension itself.

Many extensions create a small internal ledge where the follower transitions from the magazine body into the extension. Under the right conditions, that transition can create opportunities for the follower to bind or hang up.

I've seen it happen with numerous extension designs over the years.

The problem often shows up when magazines stay loaded for long periods, get dropped repeatedly, or simply accumulate wear through heavy use.

When the follower doesn't move smoothly, reliability can suffer.

Why the XTech Design Works

The feature I appreciate most about the XTech system is its internal sleeve design.

When you disassemble one of these magazines, you'll notice how the extension mates with the bottom of the magazine body.

Instead of creating an abrupt transition, the internal geometry creates a smooth path for the follower to travel.

It sounds like a small detail, but in my experience it's one of the biggest reasons these magazines have been so reliable.

Throughout my testing, I've seen this design virtually eliminate the follower binding issues I've encountered with other extension systems.

As someone who spends a lot of time shooting matches, that's exactly the kind of engineering detail I appreciate.

Easy Maintenance Matters

Another thing I immediately liked was how simple these extensions are to disassemble.

Competitive shooters tend to be hard on equipment.

Magazines get dropped into dirt, gravel, dust, mud, and whatever else happens to be on the ground that day.

Keeping magazines clean is an important part of maintaining reliability.

The XTech extension design comes apart quickly and easily, allowing me to clean debris out of the magazine body without fighting with stubborn floor plates.

Anyone who's wrestled with factory Glock floor plates knows exactly why this matters.

Testing Across Multiple Glock Platforms

For this evaluation, I ran these magazines and extensions through a wide variety of Glock-compatible firearms.

The test guns included:

Across those platforms, I was primarily looking for:

The magazines performed extremely well throughout testing.

Performance in PCCs

I also wanted to see how the magazines performed in several pistol-caliber carbines.

Many shooters today use Glock-pattern magazines across both handguns and carbines, making magazine compatibility increasingly important.

I tested the magazines in multiple PCC configurations, including direct blowback and delayed blowback systems.

Overall performance was excellent.

Every firearm cycled reliably, and the magazines functioned exactly as expected throughout testing.

OEM Magazine Extensions Are Worth Considering

One thing I appreciate about XTech's product lineup is that shooters aren't limited to complete magazines.

Some firearms simply prefer OEM Glock magazines because of tolerance differences, aftermarket frames, or other compatibility variables.

In those situations, the XTech extensions can be installed directly onto factory Glock magazines.

I've tested both configurations extensively and have had excellent results with the OEM magazine extension setup as well.

That flexibility allows shooters to tailor their setup to their individual firearm without giving up additional capacity.

My Final Thoughts

After years of testing and using these products, my opinion remains largely unchanged.

The biggest advantage is that the engineers focused on solving a genuine reliability problem that many shooters don't even realize exists.

By addressing follower travel and magazine geometry, they created a system that simply works.

As someone who depends on equipment performing correctly when the timer starts, that's the kind of innovation that matters most to me.

If you're looking for the best Glock magazine extension or complete magazine system that prioritizes reliability as much as capacity, XTech's products are well worth a look.

I'll continue running them in matches, and if you happen to attend a FAST event, there's a good chance you'll see some XTech gear on the prize table as well.

I'll see you on the range.

Glock 43 vs. Sig P365 Magazine Capacity

Magazine capacity means power. More rounds available right away means more firepower to counter threats. The next major battle of Glock 43 vs. Sig P365 is mag capacity. You’ll want to pay close attention to this round.

Sig P365 vs. Glock 43 Ergonomics and Control

The Glock 43 features similar grip textures to other Glocks, which are renowned for providing a secure and comfortable hold. The P365 has numerous grip textures and styles, depending on the particular model you choose.

Both handguns’ smaller size can make them feel more manageable for shooters with smaller hands. Their reduced height can contribute to a better fit, allowing for more natural hand positioning during shooting.

Both models share a similar control layout, featuring the slide stop, magazine release, and safety, just with slightly differing placements. The controls are accessible, even during high-stress situations, ensuring that users can operate the firearm effectively. Some P365 models include Sig’s patented accessory rail, a huge boon for attaching accessories.

This writer prefers the slightly more robust factory sights on the Sig P365 to the same Glock sights found on practically every model. However, you may hold the opposite opinion. Nevertheless, aftermarket sights abound for both models.

Trigger pull is always a point of argument among gun enthusiasts. The P365 breaks cleanly at about 90 degrees and is much preferred over the legendary stiff pull of a Glock, including the G43.

Glock 43 vs. Sig P365: Can I Hit Where I Aim?

It all boils down to this: Can I hit where I aim with a Glock 43 or a Sig P365? Arguably, this greatly depends on you, the shooter.

As for whether these handguns are reliably built and function properly, I think we can give them the benefit of the doubt. Glock and Sig Sauer have been building accurate, dependable, and sturdy firearms long enough to build massive reputations. This writer researched other comparison articles and videos in which users compared both guns at the range during actual shooting. Aside from personal preference issues, both performed reliably and shot acceptable groups at 25 yards.

Glock 43 vs. Sig P365: Who Wins?

The Sig P365 generally offers a higher capacity in a slightly smaller and more modern package than the single-stack Glock 43, and features better factory sights and slide serrations. While the Glock 43 is a slimmer single-stack, potentially offering a more comfortable concealed carry for some, the P365's double-stack design provides more rounds without a significant increase in width, along with greater modularity and a flat trigger option.

The superior choice depends on individual priorities, such as concealability, capacity, comfort, and feature preferences; personal testing is recommended.

What about other popular handgun comparisons?