Shop › LUTH AR 308 RIFLE BUFFER SPRING LUTH AR 308 RIFLE BUFFER SPRING $6.57 Luth-AR Rifle Buffer Spring, .308/7.62NATO, Fits A2 Rifle Length Receiver Extension 308-BS-10B Quantity: Add To Cart Added! Luth-AR Rifle Buffer Spring, .308/7.62NATO, Fits A2 Rifle Length Receiver Extension 308-BS-10B