This is a knurled thread protector made from 17-4 stainless steel that fits the ops 12′” aem and OCM pattern muzzle devices. It will also fit the OTB'” OTB-MB/FH'” PTB and MWA 1 piece adapters. Available in black or raw heat treat.
Otter Creek Labs OPS/AE/OC Thread Protector, For Use with Ops 12, AEM and OCM Pattern Muzzle Devices, Nitride Finish, Black OCL-303
