Kaw Valley Precision Solid Stainless Steel Heavy Buffer Features The Kaw Valley Precision Solid Stainless Steel Heavy Buffer is built specifically for 9mm 10mm .40 S&W and .45 ACP blowback AR systems that rely on buffer weight rather than a gas system to manage cycling. At 7.5 ounces it increases the dwell time of the bolt carrier slowing the action down just enough to let pressure drop before extraction. This added mass also quiets the action which helps in suppressed blowback setups where a lighter buffer would cycle too fast and too loud. No buffer spacers are required with this 4 1/8 inch overall length buffer simplifying installation in a carbine length stock or a pistol kit. Machined from solid stainless steel rather than a hollow shell with internal weights this buffer eliminates the annoying rattle that plagues many stock buffers during recoil. The increased reciprocating mass improves overall weapon reliability and reduces wear on critical internal components like the bolt carrier and buffer tube. Felt recoil is also noticeably reduced thanks to the added weight working against the blowback action. This buffer is intended for carbine length stock and pistol kit builds only making it a direct fit for most pistol caliber AR platforms running a blowback action. Kaw Valley Precision Solid Stainless Steel Heavy Buffer Specifications Manufacturer: Kaw Valley Precision Model: Solid Stainless Steel Heavy Buffer Material: Stainless Steel Weight: 7.5 oz Overall Length: 4-1/8 Compatible Hosts: 9mm 10mm .40 SW .45 ACP Blowback AR Systems Available At: GrabAGun