Kley-Zion M16/M4 5.56mm & 7.62mm Nickel Boron Complete Bolt Carrier Groups

FREE Kley-Zion CRT Carbon Removal Tool w/ Purchase The KZ Nickel Boron Polished Stainless Finish Bolt Carrier Group for your AR15/M16/M4 was created to meet and exceed all Mil Spec standards. Compatible with semi-auto and full-auto receivers. The bolts are MPI tested & Marked to give you ultimate confidence in your weapon system. Available for 5.56mm & 7.62mm Rifles. The treated Nickel Boron finish produces an exceptionally hard surface that’s 40% more wear resistant than chrome plating, with an ultra-low friction coefficient. The surface is harder than the substrate underneath and will not peel, flake, gall, or rub off. Our treated Nickel Boron finish bolt carrier groups have been tested to function reliably without additional lubrication up to 50,000 rounds. Reduced friction also means less heat generated by metal-on-metal contact, so the gun runs cooler and parts last longer. Specifications: Mil-spec Carpenter No. 158 steel Nickel Boron plating HPT Bolt (High Pressure Tested/ Proof) MPI Bolt (Magnetic Particle Inspected) Shot Peened Bolt Chrome Lined Carrier (AUTO) Chrome Lined Gas Key Gas Key Hardened to USGI Specifications Grade 8 Hardened Fasteners Key Staked Per Mil-Spec Tool Steel Extractor Extractor Spring Extractor Insert Mil-Spec Crane O-Ring 100% MADE IN USA