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I seriously do NOT recommend the PGC gearbox for anybody who fears lots of modifications.
Generally, MOST of the modifications had to be done to the metal receiver. My job would have been made SO MUCH EASIER if I had a mill... but I don't. I ended up using my trusty Dremel tool and a Tungsten Carbide cutting bit.
Depending on the metal receiver you use, you may have to do a lot of mods, or very little. The PGC gearbox comes with a media CD that contains pictures of what needs to be modded for various receiver manufacturers. Included are Hurricane, G&P v1, G&P v2, and Guarder.
Handiest tools for the install (if you don't have a mill):
1. Dremel
2. Calipers
3. Files
The piston that comes with the kit is crap and I killed it in less than 200 shots while just testing at home. Cracked in a couple of places. Piece of garbage. The sizing tolerances of the gearbox are also a bit off, so not every piston will drop right in without modifications. I ended up modifying a Prometheus Hard piston to get it to fit.
Don't listen to earlier reports of PGC not accounting anodizing thickness in to their measurements. They did. When you deal with products that have extremely tight tolerances, expect the parts to be tight! (tight is good... mmm...) If pieces go together very easily, then that means tolerances are loose. This is why AKs always work and Armalites jam easily.
In this case, tight tolerances are good as it's noticed when fitting all the pieces of the shell together. You wouldn't want that shell to be flexible when all assembled, would you?
Overall, the gearbox is very very solid. I'm liking it very much.
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