Integrated grenade ring gives the retro look you desire without hassle or extra parts. Can be used with a crush washer thats hidden in the grenade ring counter bore and not show once installed. Design inspired by the XM-177 Moderator, this extended flash hider will extend a 12.5" barrel to legal non-NFA length when pin and welded.

Features :

• "4.678" Overall Length,
• Heat Treated
• Phosphate Coated
• Crush Washer Not Included
• Clone Correct Muzzle Device for Colt 649/639/619/620 and XM177/177E1/177E2