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.
Remington 572 (.22 Rimfire Pump)
Poland's P-83 Pistol
Suppressed .458 SOCOM Run & Gun at Night
Russian M1870 Galand Revolver
FS2000 (Chapter 2)