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gkagan · April 12th, 2009, 23:36

Hey everyone.

I've got a TM M4 that I got second hand. I was wondering if anyone knew what to put in the mechbox to make it run at the equivalent of a new classic army M15A4 gearbox, that is to say, ~350 to 400 fps at ~15 rounds per second. My boss just got the M15A4 and his does a nice 401 at 15.54 rps on an 8.4v.

It has had some work done on it, and my understanding is that it's got an old systema M120S with polycarb piston, steel piston head, standard speed steel gears, yada yada, but it does 395 fps at FIVE ROUNDS PER SECOND. WITH A 9.6 VOLT. I do not think this is normal, and I would like to be able to empty my 30 round mags in 2 seconds.

Basically, I'm asking what's in a newer stock CA gearbox. Is the motor different?

Thanks all.

April 12th, 2009, 23:36	#1
gkagan Trader rating Join Date: Apr 2009 Location: Massachusetts, USA	TM M4 gearbox issues Hey everyone. I've got a TM M4 that I got second hand. I was wondering if anyone knew what to put in the mechbox to make it run at the equivalent of a new classic army M15A4 gearbox, that is to say, ~350 to 400 fps at ~15 rounds per second. My boss just got the M15A4 and his does a nice 401 at 15.54 rps on an 8.4v. It has had some work done on it, and my understanding is that it's got an old systema M120S with polycarb piston, steel piston head, standard speed steel gears, yada yada, but it does 395 fps at FIVE ROUNDS PER SECOND. WITH A 9.6 VOLT. I do not think this is normal, and I would like to be able to empty my 30 round mags in 2 seconds. Basically, I'm asking what's in a newer stock CA gearbox. Is the motor different? Thanks all.