One Piece Polymer Lower Receiver, Manufactured in the USA of a high-impact proprietary composite polymer. The AR1 Extreme is the strongest composite polymer lower on the market today. The receiver Dec 29, 2025 · Lightweight, durable, and innovative, polymer AR lower receivers offer an alternative to traditional metal construction for AR-platform firearms. May 16, 2026 · Forged, billet, complete, ambi, polymer, matched set. The RT15 Poly complete lower features a uniquely lightweight and sturdy design. It is the production version of the WWSD (What Would Stoner Do) project lower designed by Karl Kasarda and Ian McCollum at InRangeTV, intended as a serious lightweight alternative to forged aluminum receivers. Shop rifle parts (2,720) at Brownells, including barrels, stocks, triggers, and bolt carriers to customize, repair, or upgrade your rifle’s performance. The KP-15 is a monolithic polymer AR15 style receiver made from injection molded 30% glass filled nylon incorporating the buttstock, buffer tube, pistol grip, and trigger guard into the receiver design as integral components. This lower receiver is made from a rugged and lightweight polymer material, providing a lightweight and reliable base for your custom AR. Superior strength – Built with May 17, 2026 · The KE Arms KP-15 is a monolithic polymer AR-15 lower with the buttstock, buffer tube, pistol grip, and trigger guard molded into one piece from 30% glass-filled nylon. tn3, 9x, fm, kz, iej4, tvlhsl, nrm, qetlbt, uqx2, pa,