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Hi William and welcome. Plastic. This American Tactical: OMNI HYBRID model features a fully-patented metal reinforced polymer upper and lower receiver group in a beautiful Sniper Grey polymer. Cheers and stay safe!

Polymer "metal reinforced polymer upper and lower "

Hi William, both the upper & lower are Metal Reinforced Polymer. (hybrid receiver, where a small block of metal is molded into the receiver itself to strengthen it.) Stay safe & have a great day!