My experience with G&G mechbox shells have been quite positive. I consider them to be well made, and not necessary to replace unless you're going to put in a ridiculous spring.
If you're going to upgrade internally, start with a better hopup sleeve, followed by better airseal parts, followed up better bearing parts, followed up a new hopup unit.
__________________
"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."
|