Surefire Shim Kit, SF3P / SFMB / Warcomp-556, 1/2-28. Made of quality stainless steel, this shim kit assembled by Surefire is an ideal solution to properly index your muzzle device. Designed with an outer diameter of .700 & and inner diameter of .510, this kit works with 1/2 x 28 TPI threaded barrels chambered in .22 caliber, 5.56mm or 9mm. Along with a tube of Rocksett in this kit, it also features 12 shims of various thickness to allow you to accurately install muzzle devices to your firearm.Outer Diameter of .700 Inner Diameter of .510 12 Stainless steel shims of various thickness
