Kaw Valley Precision Heavy Tungsten Buffer Features The Kaw Valley Precision Heavy Tungsten Buffer uses a stainless steel body loaded with tungsten weights to bring the total mass up to 10 to 10.1 ounces since tungsten density allows far more weight in the same buffer envelope than a standard steel buffer tube weight. That added reciprocating mass slows the bolt carrier group down in blowback pistol caliber AR systems extending dwell time so the action cycles more reliably across a range of ammunition. Reduced bolt velocity also translates into noticeably reduced felt recoil for the shooter which matters on lighter pistol caliber builds that otherwise buck sharply. The heavier mass additionally reduces wear on critical internal parts by smoothing out the impulse the action experiences on every cycle. Because the extra mass slows and quiets the reciprocating cycle this buffer is a favorite for suppressed blowback builds where noise reduction depends on controlling both the muzzle and the action. At 4-1/8 inches overall length it is sized so no separate buffer spacer is required simplifying installation in carbine length stocks. It is intended specifically for carbine length stock and pistol kit configurations not rifle or other buffer tube lengths. Shooters running 9mm 10mm .40 SW or .45 ACP blowback AR platforms get a straightforward upgrade that improves reliability and comfort without any other modification. Kaw Valley Precision Heavy Tungsten Buffer Specifications Manufacturer: Kaw Valley Precision Model: Heavy Tungsten Buffer Weight: 10-10.1 oz Material: Stainless Steel Overall Length: 4-1/8 Compatible Hosts: 9mm 10mm .40 SW .45 ACP Blowback AR Systems Buffer Length: Carbine Length Available At: GrabAGun