Once sat all day in a little metal shack overlookng a beach, that took me a good 20 minutes or so to walk to (through sand and crappy cedar bush). Trained on the FN-C1-A1 in cadets we were told pretty much exactly what these things can do (and I have pulled duty more than once, stationed a mile or so behind a firing range, to warn people off. I think there's only two other options for the receiver that I can do and can't wait!
Especially if you have the gun modded out, mine atm only does 90 something damage and at 75rnds per magazine its very effective. I hope so, because I'm looking forward to grabbing a nice 7.62, been waiting for something of that calibre.