This is a Luth-AR Buffer, model CS-T2.
Luth-AR's .233/5.56 Double Tungsten H2 Carbine Buffer contains 2 tungsten slugs and a single steel slug in the buffer for a total weight of 4.8 oz. or .30 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 Double Tungsten H2 Carbine Buffer
2 tungsten slugs and 1 steel slug
