How to increase handgun capacity with magazine base pad extensions


One thing that makes a great combat pistol is capacity.

Because all service pistol calibers (9mm, .40 and .45) are less powerful than rifle calibers, it’s a good thing to have more rounds on board.

In short, the more bullets the better.


In the eighties, the term “Wonder Nine” came into popular use to describe the new generation of semi-auto 9mm pistols. One feature that set these “wonder nines” apart was the double column magazine, holding anywhere from a minimum of 10 to just under 20 cartridges.

Compared to a revolver, which often tops out at 6 rounds … or even a 1911 style .45 ACP, which tops out at 7+1, this higher capacity is welcome.

But this is America.

And we don’t like to sit on our butts and think anything is “good enough”, so what has become popular in the last few years?

Increased capacity base pads.

Today, I’ll specifically talk about how these work and the two types I picked up for some testing …

How Pistol Magazines Work …

The basic design of the semi-auto pistol magazine is pretty ingenious in its simplicity.


Most are pretty similar – they consist of a body made out of metal or plastic (or a combination of both), a baseplate, a follower and a spring.


Of course, when loaded with bullets the spring is compressed, and as each round is fired and ejected from the handgun — the spring pushes up the next bullet in line and readies it to be shot next.

The baseplate at the very bottom both holds everything together and is the integral part that the spring is pushing against that makes the whole thing work.

Now that you know how the magazine design works, you can see that if you want more capacity from your magazines, replacing the factory baseplate with one with just a little “deeper” design could increase the effective length of the magazine body and give you more capacity.

Neat huh?

The Problems With Most Extended Basepads …

There are usually two issues if you decide to play with magazine baseplates to increase capacity.

One is durability. Many of the first attempts to do this have been unreliable. That is that the baseplates will actually pop off the damn magazine and then of course, your spring goes flying and bullets fall out of your gun and you stand there with a non-functional gun.

Not something you can EVER afford to happen if you want to trust your gun as a self-defense tool.

Two is reduced function. In a nutshell, the spring has to be strong enough to push the next round up into the chamber area. But the spring was designed for a particular size magazine and when you increase the size of the magazine length (by adding the baseplate) you reduce the tension the spring. This can affect functioning from everything from loading the next round to the slide locking back as it’s supposed to on an empty gun.

Obviously, you don’t ever want this to happen with a gun you use for self-defense either.

These have been the two big complaints and failures in the past of most extended base pads and increased capacity extensions on handguns.

How New Extended Base Pads Are Earning The Trust of Shooters Everywhere …

Now that you know the potential pitfalls, you can see that the way to design an effective base pad extension is to focus on two areas:

1.) Security and durability of how the base pad attaches to the bottom of the magazine. The last thing you want is the base pad to pop off and you have a “speed un-load” when you need a gun.

2.) Spring Tension. You either need a stronger spring, or you need to make sure that the stock spring in the magazine is strong enough to push a few extra rounds out of the magazine.

In the past few years (or at least that’s when I started noticing) I’ve been seeing more and more of these extended base pads show up on serious shooters guns.

First, it’s the competition world …

The competition shooting world, in an effort to make things fair, often groups together shooters not just with relatively equal skill levels — but in categories of how many modifications they can do to their guns.

Because pulling the trigger again is always faster than reloading, the extended capacity base pads became really popular in some divisions of these competitions.

Obviously, I didn’t pay much attention because I knew about the two reliability issues we’ve discussed …

Then I started seeing them on a lot of “tactical shooters” guns too.

And I just couldn’t resist the idea of having MORE bullets in my guns!

Obviously, the designs have been improved so now I’ve picked a few up to start testing them.

I picked up The Taran Tactical Innovations (TTI) Extended Base Pads and TheTaylor Freelance Extended Base Pads.


Specifically, I got three of the Glock +5 extensions (with Wolff Spring) from Taylor Freelance. They also offer a +8 extension, but that’s too long for my uses since I primarily want to test these for concealed carry.

I also picked up the following from Taran Tactical Innovations:


– 3 of the +2 Base Pads for the Glock 43 (single stack 9mm)
– 2 of the +3/+4 base pads for the Glock 9mm
– 2 of the +5/+6 base pads for the Glock 9mm

(Except for the G43 basepad which is made specifically for that single stack 9mm glock magazine, The TTI base pads fit both the .40 S&W and the 9mm versions — so the first number refers to how many rounds of .40 it adds and the second number refers to how many rounds of 9mm it adds)

In the next part of this series, I’ll show you how to install the base pads and how that went. Plus, some important tips to make it go easier and to improve functioning.



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Caleb Lee is the #1 best-selling author of "Concealed Carry 101" and founder of He is a civilian (no law enforcement or military experience) who shares information about self-defense and becoming more self-reliant. He's a 1st degree black belt in Taekwondo, NRA Certified Basic Pistol & Personal Protection Inside The Home Instructor, Concealed Carry Academy Instructor certified & also a graduate of the Rangermaster firearms instructor course. He's also the author of numerous online courses including the course.


  1. I carry a 1911. Have you tested any extensions for them? I have a couple of 10 round magus but they have feeding problems. I would love to be able to increase me capacity to 10+1.

  2. I have a Kimber 45 with Kimber mags.. Can I use any other 45 mag without problem? Like Colt, Rugar, S&W. etc

    • I have no idea, but I have “heard” that with 1911’s sometimes there can be problems with parts interchanging like that.

    • You generally can, but the gold standard is Wilson Combat. Especially the Wilson 47D– almost flush-fit, 8-round capacity, and built like a tank. Wilsons have a reputation for making some “jam-o-matic” 1911s run like a top. I’ve been extremely happy with mine, at any rate.

      Chip McCormick mags have an excellent reputation, too– almost as good as the Wilsons, but a little cheaper. The competition shooters love ’em, especially the 10-rounders.

      Of course, some 1911s are picky, so try a brand before you dump a ton of money into their mags!

    • You don’t agree what?

      you like the Arredondo pads better?

      I haven’t used those yet. They look solid too.

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