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You would have to contact bca customer service to find out if it's compatible. Ar10 parts aren't like AR-15 parts were they are all interchangeable. There's no milspec for ar10, so usually if you have an bca upper you will need a bca lower. It won't let me post a link to bear Creek arsenal customer service so you would have to Google bear Creek arsenal customer service to contact them. Sorry but hope this helps.

Ramsey, this will fit a BCA Upper no issue. Cheers and stay safe!