Brand new polymer/carbon aramid lower receiver made by Vulcan Arms. This receiver is made with short strand carbon aramid fiber suspended in 6/6 nylon and glass. All the strength yet half the weight of aluminum receivers. All standard AR15 parts fit (standard LRPK, standard buttstock (collapsible or fixed), standard uppers all fit). This is a great receiver for mating with the AR22-101 and AR22-102 model uppers we have listed which are also made out of polymer. VERY LIGHT WEIGHT!!