Blow back with different barrel lengths.
I'm no expert on this stuff, I just worked with what I had. But, one of the guns I owned with very little blow back was a 10.5" LMT with a Vltor A5. My SR15 had almost none, but that too had the Vltor A5 at the time.
Proven combat techniques may not be flashy and may require a bit more physical effort on the part of the shooter. Further, they may not win competition matches, but they will help ensure your survival in a shooting or gunfight on the street. ~ Paul Howe
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