Primary Weapons Systems (PWS), is a federally-licensed firearms manufacturer located in Boise, Idaho known for their increasingly popular MK1 and MK2 series Long-Stroke piston system AR platform rifles. By designing the original long-stroke piston system AR, PWS took the reliability of the AK-47 action and combined it with the versatility of the AR platform, to create a cleaner, more efficient, ultra-reliable and accurate rifle available in .223 Wylde, .300 BLK, limited 7.62x39, and .308 calibers. PWS also offers a line up of accessories, compensators and more. (less)