Primary Weapons Systems UXR Magwell MD Frame AR15

The Primary Weapons Systems PWS UXR MAGWELL MD FRAME AR15 delivers advanced modularity through the proprietary UXR, or User XChange Rifle, a pinnacle of firearm innovation that lets you rapidly adapt to alternate calibers on the same serialized platform by exchanging just three partsthe magazine well, bolt head, and barrel. This patent-pending XCHANGE system, paired with a bore-evacuation chamber integrated into the barrel and a refined long-stroke piston arrangement, provides a smoother, more c