This New Frontier Armory is a complete light weight polymer AR-15 lower receiver. It is ready to bolt on to an upper and fire. It is the lightest polymer receiver on the market today. However, that light weight does not mean it is not solid, reliable or durable. Just pin in an upper and you are good to go. Lifetime Warranty.
A 15 Round magazine for the Smith & Wesson M&P 40. Constructed from
heat-treated blued-steel, with a follower, lock-plate, and base-plate
molded from a proprietary DuPont Zytel based black polymer; and using a
spring wound from Chrome-silicon wire and heat-treated for strength and
reliability.