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Reinforced Nylon 6-6 with Marine Grade Brass threaded inserts molded into the buffer collar and pistol grip for strength and corrosion resistance.
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These are not plastic. Plastic ones I've seen can crack where the hammer hits the frame by the magazine well and up where the buffer screws into the frame. This is usually along a mold seam. Have heard of cracks along the length of the upper receiver.
Have not seen a nylon lower, so... I like the idea for an AR pistol. Maybe some 3-gun rigs.