Complete 6oz hydraulic buffer kit includes a 6oz buffer and carbine buffer spring. Standard damping profile for 9mm, .40sw and 45ACP PCC's. Hydraulic buffer kit smooths out the recoil impulse of a straight blowback PCC. The standard damping profile is best for primarily unsuppressed applications in barrels of all sizes. Specifications: Buffer weight: 6oz Standard Damping Buffer length: 4.35a ^2, when compressed 3.90a ^2. (no need for a buffer spacer) Bumper color: Black Contents include: 6oz hydraulic 9mm buffer Carbine buffer spring