If you're looking to slow down your BCG to ensure proper cycling then choose from one of LBE's three fine Heavy Recoil Buffers (H1, H2 or H3). The correct buffer weight depends on type and length of barrel gas port size gas system length as well as type of ammo used.LBE Unlimited is a leading producer of US Made gun parts and accessories. Features: LBE AR-15/M16 H2 heavy carbine length recoil buffer (1) steel weight and (2) tungsten weights inside buffer body Made in the USA