Reading about Springfield's new one with a 10.5" barrel. Has what looks like a fancy blast can/diverter on it but I'll bet it could still put on a hell of a show.

I can remember going to the Knob Creek Machinegun shoot & with all the hardware on the line, the HK 91 SBR's(the short barrel, select fire variant, whatever the model is) were about as loud & produced the biggest muzzle blast of anything there. They were run on full auto of course.

I sure don't need one of the Springfields, & they are too expensive for me just as a novelty, but dammit, one would have to be a lot of fun. Provided enough ear protection could be applied.