CAR15/M4 5.56/9mm Xtra Power Buffer Spring $24.97 CAR-15, M4, & 9mm SMG action spring extra power. 16501 Out of stock Categories: AR-15, Wolff Gun Springs Related products Colt Officer Conventional Recoil Spring 24lb. $14.97 Colt Government 1911 Variable Recoil Spring 20lb. $16.97