the V3 mechbox requires alot of work to get it to fit and work properly. The PGC is a great way to go. i have one in my gun and it is amazing. You have to by regular internals to put in it.
What kind of pistons are you using in your gun. I have my old solid alumiun piston that i had with my old internals, i can't remember who made them off had again but i know that they are kind of rare. If you are interested in it, let me know, it may solve your problems with shreading pistons. It is milled from a peice of solid alumiun so it is extreamly strong.
later
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