The Geissele Reliability Enhanced 5.56 BCG is a full-mass, full-auto rated M16-profile bolt carrier group for AR-15 rifles chambered in 5.56 NATO (Geissele part no. 05-2993). The carrier is machined from 8620 steel, the bolt is Carpenter 158 steel, and the cam pin is H13 tool steel. The group is coated in Nanoweapon, a chrome-nitride finish that raises smoothness and surface hardness for corrosion resistance and easier cleaning. Longer upper rails on the carrier help prevent carrier tilt and improve feeding reliability, and each bolt is high pressure tested and magnetic particle inspected. It suits a duty, training or hard-use rifle that runs a lot of rounds.

Key Specifications

• It is built for 5.56 NATO AR-15 rifles.
• The carrier is a full-mass M16 profile, rated for full-auto use.
• The carrier is machined from 8620 steel, the standard carrier alloy.
• The bolt is Carpenter 158 steel, the material specified for AR bolts.
• The cam pin is H13 tool steel for wear resistance.
• Bolt and carrier wear a Nanoweapon chrome-nitride finish for corrosion resistance and easier cleaning.
• Longer upper rails on the carrier reduce carrier tilt and improve feeding.
• Each bolt is high pressure tested and magnetic particle inspected before it ships.

Frequently Asked Questions

Is this an M16-profile carrier? Yes. It is a full-mass M16-profile carrier, rated for full-auto use, built for 5.56 NATO AR-15 rifles.

What is Nanoweapon? Nanoweapon is a chrome-nitride coating that increases smoothness and surface hardness, which improves corrosion resistance and makes carbon easier to clean off.

What are the bolt and cam pin made of? The bolt is Carpenter 158 steel and the cam pin is H13 tool steel, while the carrier is 8620 steel.

Buy the Geissele Reliability Enhanced 5.56 Bolt Carrier Group, Nanoweapon

A bolt carrier group sees heat, carbon and friction on every shot, and this one is built from the materials and coating Geissele chose for hard use. Order it with our other AR bolt carrier groups from our Lubbock, Texas gun shop for fast, direct shipping.