I watched the whole thing. About twelve minutes. The last half, when the guns start working, is the best. I had no idea an M2 had such a high cyclic rate...

The M2 is pretty sensitive to getting the timing right, and over time wear can make one fire differently from the next.

I thought a good comparison was the fast rip of the Thompson compared to the slower chatter of the MP-40.

I can attest to the Grease Gun being that slow! Shot them 20 years ago (the M3A1 that is) when they were part of the gear on the M60 tanks, and they were a hoot.