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5.7x28 Upper Receivers

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AR57 16" Complete SLC M-LOK Upper receiver 5.7x28 w/1-50 rnd mag
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8 Product(s)
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Experience the ballistic performance of the iconic FN P90 in the familiar AR-15 platform with a 5.7x28 upper receiver from Classic Firearms. Whether you're looking for a rifle or pistol upper, we've got just what you need to complete your dedicated AR57 build for sale. Buy your next AR57 5.7x28 complete upper receiver online at Classic Firearms!

 
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