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.

Features :

• Raw Heat Treat Gold Finish
• 17-4 Steel
• Compatible with Ops Inc 12 model, AEM5 and OCM5