G&G CombatMachine Blowback Series

So I was having a discussion with a fellow airsofter in my company about the Combat Machine BlowBack series. He is a big G&G fan, however he warned me away from the CombatMachine Blowbacks, saying that he was disappointed with the quality of the gears (mainly the pinion and sector gear). However, I believe I have read and heard otherwise here. I trust his assessment, but at the same time I trust yall's assessment as well. So my question is, how good is the integrity of the Combat Machine Blowback Series?

David's piston head broke in his, and Rhino said that's like the 3rd he's seen in a week from g&g

The gears are the same between the blow back, non-blow back and Pro-line versions. Nic is correct though. I have had 3 G&G in the shop in one week. These are the Known Issues I have fixed

*Selector Switch came loose on 2 different combat machines M4's (1 blow back, 1 Non)

*Piston Head exploding 3 different M4's 1 of each combat machine (blow back, and Non) and 1 pro line m4

*Gear box front end cracked off a stock spring powered 9.6v battery GI custom blow back (plastic series)

That is all the failures I have seen. I have never had any issues with there gears or pistons. I know Reed destroyed his stock gear set after a crap load of rounds with a M120 spring and 11.1 lipo. But I know Reed abused the hell out of it.

Goo....I'm eyeing one at the moment....recommendations?

I prefer the Pro-line just for the magnesium body, But have a combat machine coming in for myself. Honestly I think they are top quality for the money and of course your gonna find a few bad apples every once in a while.

Also even though I only got about 12 shots out of my gr15, the blow back wasn't that impressive, you may not care but just letting you know.

We have several G&G M4 combat machines and G16 A2 (full metal) coming this week!
Sorry....no blow back versions.