Shop › LUTH AR 223 CARBINE BUFFER SPRING LUTH AR 223 CARBINE BUFFER SPRING $4.69 Luth-AR Carbine Buffer Spring, .223/5.56NATO, Fits Carbine Receiver Extension BS-10A Quantity: Add To Cart Added! Luth-AR Carbine Buffer Spring, .223/5.56NATO, Fits Carbine Receiver Extension BS-10A