>piston gun is generally much better than impingement Hello 2008, my old friend. I’ve done high speed and thermal camera testing on AR firearms. There is no h

>piston gun is generally much better than impingement Hello 2008, my old friend. I’ve done high speed and thermal camera testing on AR firearms. There is no honest advantage of what you are calling piston guns over DI, which is a short piston on the carrier itself. There are good and bad examples of both, piston AR pattern guns have carrier tilt, extra weight, more parts, more required maintenance, and get just as dirty esp when suppressed as DI guns. It’s an old opinion you have there. I lived through piston-mania 2008. DI effectively won when you look at anything remotely considering retrofit designs.