Primary Weapons Systems AR Series rifles are renowned for being accurate and extremely dependable. Designed and manufactured in Boise, Idaho, PWS rifles exemplify superior craftsmanship and innovation. The heart of both the MK1 and MK2 platforms is the PWS long-stroke piston system. For those who prefer to shoot quietly, the the long-stroke system makes the MK1 and MK2 rifles optimized for suppressor use. The ambidextrous controls aid in faster manipulations of fire controls. Additionally, all PWS rifles are sub-MOA guaranteed when shooting quality ammunition.