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This is a US made jam nut standard 3/4in flats to aid in tightening against flash hider/muzzle brake. Use to secure and time muzzle device to barrel.
Item received as described.
A pleasure doing business with y'all, and I'm sure I'll be a regular customer.
Works so far so good paired it up with a slingshot Mosin muzzlebrake for my PTR 91