Ultimate Piston AR-15 Meltdown!
This LMT piston AR-15 upper underwent a full-auto meltdown test, firing 833 rounds before failure. Unlike a previous DI test where the barrel failed, this piston system's internal components, specifically the bolt carrier and gas system, seized due to extreme heat. While the barrel remained straight, the piston rod warped, and the bolt carrier mushroomed, indicating mechanical limits were reached.









