These are useful for timing (positioning) muzzle devices if you want to be able to adjust the position without using crush washers. With a wrench or two you can adjust your muzzle device multiple times back and forth until you find the right position. So it's like having a reusable crush washer. Blackened steel For a 3/4" wrench 20.3mm (0.8") diameter on the corners 5mm (0.197") thick Weight: 6.9g (1/2" version) or 4.3g (5/8" version) You get: (1) Jam nut Compatible with: All barrels and muzzle devices of the chosen thread Installation Difficulty: Tools required : 3/4" wrench or substitute Installation notes: Gett'er done, tighten it against the muzzle device to effectively lock the device in place
Brand Name : None
Distributor : Truenortharms.com
Distributor Product ID: 4699
Distributor SKU: 688748046552-1
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