The Foxtrot Mike Products FM-45 Extra Heavy PCC Buffer is the perfect weight to ensure reliable feeding of any blowback operated PCC. At 4.125 inches overall length, it requires no spacer and helps prevent bolt catch breakage. Smoother function, less felt recoil, and reduced rate of fire from your AR pistol. The FM-45 Extra Heavy Buffer is compatible with all 9mm/45 upper receivers. Compatible with all blow-back 9mm and .45 upper receivers. Salt bath Nitride finish provides enhanced lubricity and wear-resistance. Heavy 8.5 oz. (pistol) weight.*Buffer bumper color may vary.