This is a Luth-AR Buffer, model CS-T3.
Luth-AR's .233/5.56 Triple Tungsten H3 Carbine Buffer contains 3 tungsten slugs and a single steel slug in the buffer for a total weight of 5.6 oz. or .35 lbs. Using a heavier AR-15 buffer helps reliable function with short gas system rifles. You may also experience a reduction in felt recoil.
Features:
.233/5.56 Triple Tungsten H3 Carbine Buffer
3 tungsten slugs and 2 steel slug
