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Teryl, yes these will work in your PW BP12 Bullpup. Have a great day!

Teryl, yes these are compatible and so is this 15rd drum : https://www.budsgunshop.com/product_info.php/products_id/714025798

Yes, this will fit and function just fine. Any ar12 magazine or mka 1919 magazine or drum will fit your bp12. Hope this helps.