MUZZLE BRAKE & COMPENSATOR to suit GLOCK pistols, UPC: : Does not apply, See all condition definitions : Model: : COMPACT1. 1/2x28, Condition:: New: A brand-new, Brand: : gunbloke, unopened and undamaged item in original retail packaging, GLOCK COMPACT1 Muzzle Brake Compensator G17 G19 G26 1/2x28. 1/2" UNEF, unused, it may be delivered in non-retail packaging, such as a plain or unprinted box or plastic bag. If the item comes direct from a manufacturer. "THE COMPACT1 " Muzzle Brake & Compensator provides maximum recoil reduction & muzzle jump compensation. "THE GLOCK COMPACT1 ", where packaging is applicable, See the seller's listing for full details. com: MPN: : COMPACT1-1/2x28, 1/2" UNEF, thread.