Luth-AR's .223/5.56 H1 Carbine Buffer assembly contains 1 tungsten slug and 2 steel slugs in the buffer for a total weight of 4 oz or 0.25 lb. Using a heavier AR-15 buffer helps reliable function with mid-length or short gas system rifles. You may also experience a reduction in felt recoil. Features: .223/5.56 H1 tungsten carbine buffer Heavier AR buffer (1) tungsten slug and (1) steel slugs