By Alex C.
The Armalite AR180 is the civilian version of the select-fire AR18 rifle. Chambered in 5.56, they were intended to allow nations with limited machining capabilities the ability to manufacture modern military rifles in the spiffy new 5.56×45 cartridge. While the rifle did not enjoy much success or proliferation, its gas system serves as the basis […]
Via: The Firearm Blog