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delta76 · August 24th, 2009, 01:46

I'm currently putting together a custom build M4A1 (front wired), and I've been looking for a complete drop-in mechbox. I've limited by budget to $200 for the mechbox because at the moment I've gone over my head on externals.

I've been looking at the G&P M120 8mm complete gearbox that Jugglez retails for $199. In a perfect world I'd probably go with a Systema, but I thought I'd look into this first. I've been trying to find reviews/info on the quality of this gearbox and so far I've only been able to find one thread, and it wasn't pretty (shattered gears after a few thousand rounds; and I wasn't too impressed with the quality of the internals). I'm not sure what setup the gearbox was run on, but I remember reading something about a lipo being used.

My questions are: (note I've tried to answer them myself but haven't found anything definitive)

Is this mechbox lipo-ready?
If I run it with a lighter spring what would the effect be?
Are internal failures common with G&P?
I'm pretty anal about airseal so I'll probably end up swapping out the cylinder head, piston head, and nozzle; are systema components markedly better in terms of airseal?

Are there any other complete, drop-in mechbox options in this price range that may perform better, or should I suck it up and go with a Systema?

August 24th, 2009, 01:46	#1
delta76 Trader rating Join Date: Dec 2008 Location: Toronto	G&P Mechbox/Internals quality I'm currently putting together a custom build M4A1 (front wired), and I've been looking for a complete drop-in mechbox. I've limited by budget to $200 for the mechbox because at the moment I've gone over my head on externals. I've been looking at the G&P M120 8mm complete gearbox that Jugglez retails for $199. In a perfect world I'd probably go with a Systema, but I thought I'd look into this first. I've been trying to find reviews/info on the quality of this gearbox and so far I've only been able to find one thread, and it wasn't pretty (shattered gears after a few thousand rounds; and I wasn't too impressed with the quality of the internals). I'm not sure what setup the gearbox was run on, but I remember reading something about a lipo being used. My questions are: (note I've tried to answer them myself but haven't found anything definitive) Is this mechbox lipo-ready? If I run it with a lighter spring what would the effect be? Are internal failures common with G&P? I'm pretty anal about airseal so I'll probably end up swapping out the cylinder head, piston head, and nozzle; are systema components markedly better in terms of airseal? Are there any other complete, drop-in mechbox options in this price range that may perform better, or should I suck it up and go with a Systema?