Thought you were going to tell us you took it out and ventilated it with this alley sweeper...
Yes they are...I wonder if one could use thinner wire springs and slow it down? I wonder if it would work? I know the M3 I had ran like a monster when I used springs out of a Bren or FN butt...sounded like and Ingram. Had 10 casings in the air at once. Once I used a thinner wire it slowed some...