CMMG .308 Win/7.62 Bolt Carrier Group, Black - 38BA423
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CMMG
Overview
The CMMG .308 Win/7.62 Bolt Carrier Group is a crucial component for builders looking to assemble a reliable .308 platform. Constructed from steel and finished with a phosphate coating, this BCG ensures durability and consistent performance under various conditions. It is designed specifically for rifle-length gas systems, making it an ideal choice for builds focused on the .308 caliber.
Specifications
CMMG .308 Win/7.62 Bolt Carrier Group, Black - 38BA423
September 2026 on GunPartPicker
CMMG .308 Win/7.62 Bolt Carrier Group, Black - 38BA423 ranked #11 of the 217 bolt carrier groups builders added on GunPartPicker in September 2026, behind the Sons of Liberty Gun Works AR-15 5.56 Bolt Carrier Group 158 Carpenter Sp/HPT/MPI, with about 2% of all bolt carrier groups added to builds. Down from #10 in August. Builds with this bolt carrier group are mostly chambered in .308 Win (84%, then 5.56 NATO 10%), split between rifle-length (55%) and mid-length (39%) gas systems, and mostly AR-10 (78%, then AR-15 22%).
It was hard to find in September 2026, in stock on only 15 of the 28 days we checked, and today 4 of the 7 retailers we track have it in stock. It dipped to $221.36 at BattleHawk Armory for a stretch in September 2026, under its usual $243 to $301.54, so sales do come around. Buying today, the lowest price is $255.40 at Classic Firearms, above September's low of $221.36, so a better deal may come back.
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Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
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