JP Rifles Centerless Operating Spring 308 Carbine

Precision centerless ground and polished operating springs offer a smoother and quieter operation in AR buffer tubes. Improved impulse feel results in faster sight recovery and improved reliability. Outer-diameter is ground and polished for smooth, quiet movement in the buffer tube. Rifle fits fixed stock rifles with A1/A2 buffer tube. Carbine fits collapsible M4-type carbine-length buffer tube. 308 Rifle - Fits AR10 and 308 AR fixed stock rifles with an A1/A2 buffer tube. 308 Carbine - fits AR10 and 308 AR carbine buffer tubes. JP Enterprises recommends the use of JP Tuned and Polished 308 Buffer Springs when using the JP 308 Low Mass Bolt Carrier Group Mfg: J P Enterprises SPECS: Steel, polished finish. Rifle - 13A 1/4" (34cm) long. Carbine - 11A 3/4" (30cm) long.