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https://buckhallsportinggoods.com/product/ar57-upper-assembly-5-7-x-28-fn-16-new/

Buckhall Sporting Goods Transforms an AR-15 to fire 5.7 × 28 FN. Unique leading layout great deals on the top as well as accepts FN PS90 magazine (not included) and ejects downward via the AR-15 mag well. Upper