Shop › LUTH AR 223 RIFLE BUFFER SPRING LUTH AR 223 RIFLE BUFFER SPRING $4.22 Luth-AR Rifle Buffer Spring, .223/5.56NATO, Fits A2 Rifle Length Receiver Extension BS-10B Quantity: Add To Cart Added! Luth-AR Rifle Buffer Spring, .223/5.56NATO, Fits A2 Rifle Length Receiver Extension BS-10B