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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.
great and easy to use
Product works as described.
Worked very well
Its a bit thick to be a 5 star product, it doesn't leave many threads for the muzzle device. But its a must for mall ninjas or shooters who aren't sure which break they like the best.