Great mag extension. - Shield Arms SIG P320 +5 Magazine Extension

I picked up one of these a couple of months ago and put about 150 rounds through it. Feeds flawlessly on 15 round mags in an X-Compact. This includes fmj, 124gr HST's, and some sig V-Crown. It mounts solidly to the mag but there is a small gap between the rail of the mag and the lips on the extension. Seems to be purely a cosmetic issue. It carries surprisingly well in a low profile soft mag pouch. It will likely print more in a Kydex carrier. This is a great "why not" product. Sure it's the price of a whole new mag, but it looks awesome. It's a great solution if you want an extended mag that sits nearly flush, top of base to frame, in a compact frame. The gap is much less than an OEM 21rd mag in an X-Compact frame. If you've got the change lying around you ought to give it a try.