Looking for the best Gas Piston System. Look no further! Black Rifle Arms has developed the most innovated Gas Piston Systems, best bolt carrier groups, enhanced firing pins, extended firing pins, gas piston, piston, piston uppers, 300BLK Piston Uppers
Grabbing some mags for your Radial Delayed Blowback 9mm? These Gen II 9mm magazines work in Mk4/AR15 lower receivers with a CMMG 9mm Radial Delayed Blowback upper and feature 10rd capacity and iconic CMMG styling. Exterior dimensions closely match those of common 5.56 AR15 magazines for cross-compatibility with existing mag pouches and carriers.