Home2x Quality CNC Stainless Steel Jam NutsChoose either 1/2x28 or 5/8x24 thread pitchMil-spec USA made2x Stainless Steel Jam Nuts 1/2x28 OR 5/8x24 for .223/5.56 OR .308/300 Blackout$6.95PriceThread PitchSelectQuantityAdd to Cart