Optimize the performance of your 9mm AR platform with the Guntec AR Stainless Steel 9mm Buffer. Engineered specifically for blowback-operated AR-9 builds, this heavy-duty buffer delivers consistent cycling, reduced recoil impulse, and enhanced reliability during rapid fire. Technical Specifications Material: Stainless steel body with polyurethane bumper Weight: 8.2 ounces Length: 4 inches Compatibility: Mil-Spec carbine receiver extensions Caliber: 9mm