J P Enterprises Ar-15 .750 Jam Nut 1/2-28"
J P Enterprises Ar-15 .750 Jam Nut 1/2-28", High quality hex jam nuts for indexing muzzle devices. Available in black or stainless steel for 1/2-28 threads. Mfg: J P Enterprises SPECS: .200 thick. Requires use of thin wrench to tighten against brakes and comps.