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Originally Posted by Droc

reinforced mechbox isnt much better...They still crack. You can only slightly improve a flawed design.

Go with a polycarb piston...although, of all the pistons I have used, a stock TM piston is still better then many aftermarket ones.

Its big bucks. For that price, Id look into a systema complete mechbox.

for 390fps, generally, you want an irregular pitch spring, spring guide, bushings, and shims...Reinforced mechbox if you can spare the cash.
Extras. Systema silicone piston head and cylinder head.

Honestly, not to take business away from ken, but ask around for WGC group orders...parts are fantastically cheap. I find canadian retailers offering upgrades isnt worth it...I held out and got in on orders and I built my mechbox for a fraction of the price that canadian retailers were offering.

If you have the money, get a hurricane reinforced mechbox. Not that its essential, but if you crack your mechbox, you dont always know it...suddenly gears are destroyed, parts are snaped and your out a lot of money.

Nicely said Droc.