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That mechbox is the same one that comes in most of JG's HK416s and is pretty good. If you downgrade the spring to something more realistic than an M130, it should be perfectly fine and durable. However, I didn't replace the spring and the shell ended upg cracking on me, despite it being a reinforced shell. I have another one of these in my custom C8 downgraded to an MS110SP spring and it's shooting well and no trouble as of yet, although only put about 1000 rounds through it in testing and plinking so far.
However, I'll agree with M102404. Install metal bushings, and bearing spring guide and possibly an M90 spring and a tightbore and you'll be close to 350 fps and well within tolerance limits for a stock TM shell. Velocities over 350 fps (from the mechbox alone, not counting a tightbore) tend to be quite hard on a TM shell and will shorten its lifespan significantly. It will be much cheaper to go this route and will give you the results you're looking for.
On a side note about these JG mechboxes - those motors ROCK. They have an assload of torque and good speed. IMO, they perform a lot better than TM or CA stock motors.
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