Well, the twin crank fired 16.25 inch 1919A4's are hard on the ammo budget, but a great deal of fun!
Kevin from downrange.com was setup right next to my BP 81mm Mortar (you can see the base plate behind my foot) and the muzzle blast was worse from my twin shorty 1919's then his M2.
The shorty version of the 1919 (any caliber) is very popular (if I remember correctly the last shoot we had around 14 1919's on the line, and half were shorties).
What would be interesting is to mount a muzzle brake (like those on the 50 rifles) but in reverse, to redirect the gases forward and to the sides at a 45 degree angle. I would make a pretty picture lol
So many toys, so little time (or money)