Magpul 17 Round 9mm Magazine for Sig P320/M17/M18, Full Size/Compact/Sub-Compact, Stainless Steel

I bought a couple of these for my Sig Sauer p365 XMacro Comp. They do hold 17 rounds and cycle very well with different grain weights (115, 124, 147). My only gripe is that the numbered holes on the mags are off by 1 after you load the 5th round. When you load 5 rounds, the mag reads 5, but every bullet after that is off by +1. The annoying part is when you load 16 rounds the mag reads that it is full. If you lose count, you have to remove a round to make sure you're not actually at 17. Other than that I like the stainless look and they are cheaper than the OEM mags from Sig.

These things work fantastic and have a great spring and followers. I prefer them over the factory style.

Fits perfectly in all of my Sig pistols (2xP320 + 1 P211) and works flawlessly. I do recommend using mag extensions if using in pistols with maxwells like the OEM P211 magwell to avoid issues with proper seating of the magazine.

These mags will not take 17 rounds. I bought 2. It barley takes the 16th round. The internals and a 1/2 a coil too much spring takes the room for the 17th round. Bad quality control or or poor counting.