Beyond Stoner's AR-15
Introduction: Eugene Stoner and Jim Sullivan designed the AR-15 to be a lightweight, reliable rifle that could continue to run in fairly adverse conditions. The gas system of an AR rifle plays a huge role in its design. The quasi-direct-impingement gas system that Stoner designed has proven itself to be reliable enough for combat around the world. The buffer tube and bolt carrier group provide a soft, straight recoil impulse that is notoriously easy to control. This all being said, companies are continuing to iterate on the original AR-15 design and seeking to improve it further. Details: One of the most popular design changes made to AR-15's has been in the gas system. Multiple different companies have converted AR-type rifles from their original configuration to some sort of gas-piston system. The most popular conversion I've seen is a short-stroke gas piston system. I think the most famous of these systems is the one in the HK 416. The HK 416 utilizes a short-stroke gas p