Armaspec SRS Gen4 Recoil Spring Features The Armaspec SRS Gen4 Recoil Spring installs as a drop-in replacement for the standard AR-15 buffer and spring so no permanent modification is needed to upgrade the recoil system. Its multi-stage design keeps the buffer spring from rubbing against the inner wall of the buffer tube which is what produces the rattle and friction felt in many mil-spec setups. The second stage of the spring is built specifically to reduce felt recoil giving the shooter a smoother cycling sensation shot to shot. An adjustable spring weight lets the end user fine-tune the system s tension to match their build and ammunition. Constructed from stainless steel for durability the SRS Gen4 is built to handle the repeated compression cycles of an AR-15 action without losing performance over time. Its buffer mass is designed to stay under constant tension against the bolt carrier group which helps keep the action cycling consistently and reduces bolt bounce. At 7.18 inches and 5.6 ounces it fits within a standard mil-spec buffer tube without any special tools or gunsmithing. For shooters looking to smooth out recoil impulse and quiet down their AR-15 without a full buffer tube swap this spring is a simple effective upgrade. Armaspec SRS Gen4 Recoil Spring Specifications Manufacturer: Armaspec Model: SRS Gen4 Recoil Spring Compatible Hosts: AR-15 Material: Stainless Steel Bolt Type: Drop In Length: 7.18 Weight: 5.6 oz Available At: GrabAGun