AR cyclic noise

[rumlover]

All,

Related to the AA9 post....but different issue....same weapon and 50 round trial.

Even when rounds were below 1020fps, I still could hear a lot of noise that sounded like it was report, not the weapon cycling. It was on the order of a 22LR.

The question: For those of you with an adjustable gas block, is the difference in sound much greater when the gas is shut off v/s on?

Thanks,
Rum