Our Tacfire recoil buffer absorbs the shock from the action operating, rather than having metal to metal contact. The Glock Recoil Buffer will reduce recoil impulse and prolong the service life of your firearm. It is made from high strength industrial polymer, black finish. Compatible with models 17, 17L, 18, 19, 20, 21, 22, 23, 24, 24C, 31, 32, and 37.It will NOT fit Subcompacts, Slimlines or Gen 4 Glocks.