The M170 will eat your sears, even the zero trigger, really quick. Also, there are different models for 1-3, all have pros and cons. I have forgotten most of what I used to know about APS2 rifles, so someone else can chime in here, but why would you switch to an AEG hopup unit when the stock APS2 one is vastly superior? Just a thought, and again, I used to know a lot more, but it's escaping me right now.
"As I walk through the valley of the shadow of death I shall fear no evil because I am the biggest mother f**ker in the valley."
Guns: KWA SR12, G&P M4A1 RIS, TM Glock 17 w/ PGC Metal Slide & Barrel, Boneyard Y&P Mk23 NBB