In my original First Shots video with the Beretta ARX100 I mentioned that the gun didn't work with Gen 3 PMAGs. That set-off a bit of a firestorm in the comments and I wanted to clear the air on what mags do work and what mags do not.
RP9 Torture Test!
Hi-Point 9mm Carbine 995 TS
A Review of the Brownells BRN-601
Pedersen PA Carbine
Slow Motion 1907 Dreyse Pistol