3years, 1500rpm, 380fps
G&P M249's mechbox has NEVER broken down
I've nearly stripped the piston once due to messing up my TM configuration, put 2 new motors in it, broke the anti reversal latch spring once, and popped the feed tube off my box mag 3 times (I have a spare box mag just incase), but the mechbox has never stopped working ever
My M4 on the other hand, broke all the G&P gears, piston head, the O-ring off my aluminum piston head got wedged into the port in the cylinder somehow, 5 broken trigger springs, 2 broken triggers, 2 hopup rubbers and 3 motors.
But I still get more kills with my VSR than I do with my 249 on average. The 249 is just more fun