Shop › LUTH AR 308 CARBINE BUFFER SPRING LUTH AR 308 CARBINE BUFFER SPRING $6.10 Luth-AR Carbine Buffer Spring, .308/7.62NATO, Fits Carbine Receiver Extension 308-CS-10A Quantity: Add To Cart Added! Luth-AR Carbine Buffer Spring, .308/7.62NATO, Fits Carbine Receiver Extension 308-CS-10A