The 7.62 QDC OPEN BRAKE KIT, 3/4"-24 TPI, developed for 7.62/6.5 platforms.

It accepts KAC’s QDC line of sound suppressors, includes 7 piece shim set and Rocksett Dose 3/4"-24 thread

Compatible with Knight's Armament SR25, does not fit most .308 rifles which use 5/8"-24 thread.