The three nost important things on a saw are the shimming, the AOE, and the ROF.
You need your gears to be properly shimed so they dont strip or fail catastrophicly. AOE needs to be perfect so your piston doesnt explode. And you want your ROF above 25 bb/s, I find between 25 and 30 bb/s to be the sweet spot, you dont run out of ammo too fast and you can keep down alot of heads. no sense in carrying around a saw shooting 12 bb/s when you can get the same effect from an m4 and a few midcaps. You have a big box mag, may as well use it.
If you dont want to do the work yourself, an AD classic drop in gearbox is perfect. Though i would still bring it to your local doc for a shim job and change the wiring to 16 ga. You will also want the spare gearbox just in case yours fails. At 90$ it wont break the bank.
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