The AR10/LR Crush Washer fits most barrel profiles and allows proper attachment of muzzle device and has 12 Pieces per pack. It ensures proper indexing of a flash hider or muzzle brake.
Specifications:

Type	Crush Washer
Model	Crush Washer
Dimensions
Size	N/A
Material	Steel
Action
Trigger
Safety
Thread Pattern
Finish	Black
Bolt Type
Hand
Hammer Type
Max Capacity