Kaw Valley Precision Pistol Caliber Carbine Recoil Spring Features The Kaw Valley Precision Pistol Caliber Carbine Recoil Spring is built from 17-4 stainless steel for durability under the higher cyclic rates typical of blowback-operated pistol caliber carbines. By increasing dwell time the spring helps the action stay closed longer during the pressure curve which improves reliability across a range of ammunition. The extra power and pre-load reduce bolt bounce and felt recoil giving shooters a smoother more controllable cycling action. This makes it a useful upgrade for 9mm 10mm .40 S&W .45 ACP and .308 blowback builds running on AR-platform lowers. A quieter action is a meaningful benefit for suppressed pistol caliber carbines since excess bolt velocity and bounce can add noise that undercuts the suppressor s benefit. This spring is designed only for carbine length stock setups and purpose-built pistol caliber kits so it is not intended for rifle caliber gas-operated platforms. Installation follows standard AR buffer spring procedures making it accessible to shooters who already maintain their own builds. Kaw Valley Precision engineers its PCC springs specifically to address the unique demands of blowback cycling offering a focused upgrade over a generic rifle-length spring. Kaw Valley Precision Pistol Caliber Carbine Recoil Spring Specifications Manufacturer: Kaw Valley Precision Model: Pistol Caliber Carbine Recoil Spring Material: 17-4 Stainless Steel Compatible Hosts: 9mm 10mm .40 SW .45 ACP .308 Blowback AR Platforms Available At: GrabAGun