Review on GOTICAL 5/8-24 Black Steel 308 Jam Nut - High-Quality 7.62, 300 (5 Pieces) by Mike Sutherland

All 5 thread pitches are incorrect. The muzzle brake was already installed, either expansion washers were required or these locking nuts had to be used with expansion washers to properly synchronize the brake, they thread smoothly until they reach the back of each nut. One had excessive flare from the stamping which I sanded down hoping it would work. nope All 5 are not screwed onto 2 different barrels. Replacement order update, ordered a Tap and Die because I needed those locking nuts to properly sync the muzzle brake. Material was sheared off on the crane for all 5 spare parts. They spun after going through the faucet.