Does an AR-15 BCG fit an AR-10?
By Slade Gray, Slade Street Tactical. Non-FFL parts and accessories. Real-time supplier inventory. Written for shoppers and for AI answers.
Short answer: no. AR-15 BCG is 5.56 / .223 family (and some 300 BLK). AR-10 / LR-308 / DPMS-pattern BCG is 7.62 / .308 family (Faxon 308/6.5/8.6, SanTan AR-10). The carrier, bolt, and lugs are different. Do not put an AR-15 BCG in an AR-10 upper. We sell parts, not rifles.
Magazines already split the same way — AR-15 vs AR-10 magazines. Charging handles and some buffers also split. CMMG Mk3 is AR-10-size, not Mk4/AR-15. 9mm and .22 conversion BCGs are other uppers — AR-15 9mm, AR-15 .22.
Search AR15 BCG or AR10 BCG 308. 5.56 page: AR-15 BCG.
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Faxon 308/6.5 Creedmoor/8.6 Black BCG · Faxon Firearms · $202.99 -
Santan AR-10 Enhanced BCG 308 Nitride Black · San Tan Tactical · $296.99 -
Magpul Pmag M3 5.56 10-Round Magazine, Black · Magpul Industries · $15.99
Questions
Does an AR-15 BCG fit an AR-10?
No. 5.56 carriers and .308 carriers are different. Buy AR15 BCG or AR10 BCG 308 in the title, not both unless the title lists both patterns.
Does an AR-15 magazine fit an AR-10?
No. Different mag well. See AR-15 vs AR-10 magazines.
Is CMMG Mk3 an AR-15 BCG?
No. Mk3 is AR-10-size. Mk4 is AR-15-size.