Bill Geissele builds nearly everything else that goes into a full rifle, so it was only a matter of time before he built a BCG — and the Reliability Enhanced Bolt Carrier Group lives up to the name. The REBCG is a 5.56mm, full-mass, full-auto-rated M16/M4 bolt carrier group, and it's one of the cleanest-running, hardest-wearing carriers in the catalog.
The carrier is machined from mil-spec 8620 steel and features a properly torqued and staked, chrome-lined gas key. The cam pin is H13 tool steel. The bolt is forged from Carpenter 158+ steel — a cleaner, more consistent alloy Geissele co-developed with Carpenter to push bolt service life well past mil-spec expectations. Every bolt is HPT and MPI tested, then coated. The finish everyone notices first is Geissele's Nanoweapon — a durable solid lubricant in the family of coatings developed at Picatinny Arsenal. It's applied cold so it doesn't alter the part's metallurgy, comes in at roughly 82 HRC surface hardness, shrugs off carbon, and runs with less lubrication than traditional phosphate.
Features include extended upper rails for improved stability and feed reliability, and that distinctive lighter-steel extractor. MPNs 05-490, 05-1014, and 05-2993 are all sold as REBCGs; Geissele unified cam pin designs across production, and we ship the current REBCG configuration. Order yours from Charlie's today.
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