AR 15 & AR 10 Lower Receiver and Upper Receivers for sale at Noreen Firearms. Built in our facility in Belgrade Montana, our 100% ar15 and AR10 receivers are the best in the business. We offer forged and billet receivers but all get the same attention to detail. The 100% AR15 receivers accept MilSpec components and the 308 receivers are patterned after the DPMS gen 1 specification. Nearing 50,000 receivers made in the last few years Noreen Firearms is one of the largest manufactures in the country, and the largest billet manufacture of modern sporting rifle receivers.