NiB-X M16/AR-15 Full Auto Bolt Carrier Group BCG – POLISHED All WMD BCG components are manufactured by Defense Industrial Base suppliers to WMD’s exacting specifications to provide the best BCG available. Specifically engineered for NiB-X nickel boron coating to provide long life, high reliability and easy cleaning and maintenance. The BCG components are coated and polished to reduce fouling adherence. Coating is guaranteed for life against chipping, spalling or flaking. Over 30K rounds in Government protocol endurance testing did not wear the coating off. Especially beneficial in short barrel setups and suppressed platforms. Specifications for WMD Guns AR-15/M16/M4 Full Auto Bolt Carrier Group (BCG) – NiB-X Nickel Boron Polished: Manufacturer: WMD Guns Color: Nickel, Silver Finish: NiB-X Fabric/Material: 9310 Steel, 8620 Alloy Steel Cartridge: 5.56x45mm NATO Gun Make: AR Platform Gun Model: M16, M4, AR-15 Condition: New Bolt Material: 9310 Steel Carrier Material: 8620 Steel Features of WMD Guns AR-15/M16/M4 Full Auto Bolt Carrier Group BCG – NiB-X Nickel Boron Polished: Bolt- Case hardened 9310, shot peened, magnetic particle inspected, with high-performance extractor, ejector springs, gas rings and special O-ring buffer. Extractor – Manufactured, heat-treated, and hardened per government drawings; NiB-X coated. Firing Pin – Manufactured, heat-treated, hardened, chromed and certified per Government drawings. Carrier – Faceted M4/16 style full auto (heavier) functions in AR15 and M4/16 platforms, 8620 material, heat treated and case hardened. Manufacturing tolerances and surface finishes tightly controlled. NiB-X coated for durability and ease of cleaning. Gas Key – Hardened to USGI specifications and attached using grade 8 hardened fasteners. Permatex No. 3D Aviation Form a gasket Type III Sealing Compound per MIL-S-45180 used on assembly. NiB-X coated. Staked per military specifications. Cam Pin – Manufactured, heat treated, hardened and certified per government drawings. NiB-X Coated. Package Contents: WMD Guns AR-15/M16/M4 Full Auto Bolt Carrier Group – NiB-X Nickel Boron Polished
Shmee –
Got one of these for an upper that I assembled and I’ve probably put through hundreds of not a thousand and it has been reliable. No malfunctions or anything breaking. It just keeps going even when I haven’t cleaned it.
kaizenboi –
Great quality product with no issues whatsoever. Worked well for my AR build.
Bronco –
Came quick and looks like what I wanted nice work. I would by again if needed.
kaizenboi –
1st time using this BCG and I like it a lot very smooth and runs flawlessly. I would definitely purchase another one for my other AR platform.
Nicholas Knight –
Nothing bad to say here, Worked like a dream even after 1,000 rounds! No issues with the staking on the key, no discoloration from lack of lubricity, just install and go! Almost bought another companies for $100 more until I saw this one for cheaper on OP. No arguments from me on saving some money
Christopher Greenwell –
Great bolt carrier. Works exactly as advertised. Good price!! Quality product. Bought one for a new build and have now completely swapped over. Finish is nice but gets dirty easy. No need for excessive lube during break in.