Centurion Arms, to spec, OPS Inc. brake and collar for use on the MK12 barrel.
Included:
Brake w/ Thread Protector
Collar (Long) w/ Set Screw
Crush Washer
**Please note that older batches of Centurion Arms MK12 barrels may require some filing/opening up on the collar in order for it to fit without being too tight and marring the barrel.
