Weight 1Lb 2.1oz – Forward Porting Enlarged Vents. – Balanced flared boss. – 8620 Carrier Heat Treated Hard Turned. – MPI 9310 Bolt Hard – Turned / Ground. – NiB UCT EXO Coating. – CP-R360-H Domed Cam Pin – Mil-Spec Gas Rings – Mil-Spec Staked Gas Key – Grade 8 Hardened Fasteners – All Hard Chrome surfaces are to MIL-STD-171 1.2.2.2 – Lifetime Warranty. – Made in the USA.