AGP Arms Springfield XD9/40 and XD MOD.2 +4 Magazine Extension

I had a few of these extensions and I like them so much that I got more for the rest of my XD mags. They look like the gun was designed to have them on it. Getting 20 rounds in tends to require the help of a good speed loader but it can be done and feeds the first round normally. When assembling or disassembling it, beware that the extra power spring can cause extra power flying parts!

I only got +2 from my 16 round mag, and with the extension the mag release is far more difficult to depress on either side. Not happy that it's not +4, but I can beef up my thumb squeeze and I'll take the +2

Easy installation. Full mag rattles a little bit not a deal breaker. Haven't had a chance to shoot yet—I've manually racked through a couple of full mags without a problem.

fits great, easy to install, 4 extra rounds !

Spring has a lot of shake when make is full

I don't know they said just +4 but it's +6 on my mag lol with the spring that comes with, just to be clear, and quick shipping too highly recommended

Overall these are pretty good. The only extensions I've found for the XD that actually lock into place. Two of mine worked great, but two had to have the edges filed down significantly just to allow the magazine to seat in the magwell and then also be able to easily be released with the button. Once I finally filed them down sufficiently the work well. The other drawback is that they are extremely difficult to remove once installed. Not impossible, but I have yet to find a single way to do it successfully every time. Also, the springs compacted after the first loading and significantly lost their power. The slide still locks back after the last round, but I'm nervous that any further compaction of the spring will eventually lose the lockback.

Didn't come with instructions but easy enough to figure out how to install. Really solid product. I did need to us a loader to get all 20rd in. I would recommend this to my friends.

I bought three extensions and added them on to one XD9 and two XD40SC magazines. In the .40 however, it will only accept three extra rounds. Nevertheless, I now have a backup 15 round magazine that I can carry in my pocket for my EDC. I have heard people talk about not using extensions because the plate will pop off the bottom, but AGP is correct when they say this will not happen with their extension. It is on solid (that also means that if you want to take it off, it's a hassle, as I found out, but not impossible. I consider this a positive, however, because it means I can trust the extension to stay on). One negative about this extension: if you want to use it with the XDSC 12 round mag and the extension (the part that just fits around the mag), you have to trim off the top part of the plastic on the lip of the AGP extension in order to get it to fit. That's not difficult however, as it just takes dragging knife or sandpaper across it a few times. All in all, a very easy, quick, and cheap way to get a three/four extra rounds loaded up.