It wouldn't stabilize tracer rounds, it was perfectly fine with standard issue rounds. The manual bold close wasn't in Stoners original design, it was requested

It wouldn't stabilize tracer rounds, it was perfectly fine with standard issue rounds. The manual bold close wasn't in Stoners original design, it was requested by the military. In my opinion the internal piston design is the true genius of this rifle. Recoil is almost straight back so follow up shots are much easier. As the Russians seem to be moving to 5.56 the American military is looking to move to the 6mm class.