The TTI Ultimate Light Speed Buffer Spring is designed by Taran Butler to achieve the fastest follower up shots and the quickest target to target acquisition possible by eliminating excessive muzzle dip and rearward bounce caused by over powered factory springs. Also allows the shooter to have a wider variety of shooting 36 to 80 grain bullets with greater reliability. This buffer spring is gear towards more advanced shooters and 3-Gun competitors that use adjustable gas blocks or premium quality barrels that have the smaller diameter gas holes. The TTI Ultimate Light Speed buffer spring works in both A1/A2 length stocks and Carbine M-4 collapsible stocks. Combine our buffer spring with the JP Enterprises Low-Mass Recoil Buffer System to achieve the ultimate results. This TTI black chrome silicon buffer spring comes with a Life Time Warranty!