A couple of things to consider at this point:
- DON'T buy a guarder mechbox shell...junk
- Consider buying a complete assembled mechbox
--- what is the condition of your current switch assembly? If it's burned out and worn you'll want to switch it out now.
--- do you want to mess with transplanting all the guts of your current mechbox into the new one?
--- if you're running plastic bushings in the TM box now...you'll have to buy bushings and reshim it all. You should reshim anyways going into a new shell...but with a complete mechbox the shimming should be at least most of the way done for you (and sometimes it's just done complete nice out of the box...but you should check).
--- might not be an issue...but some parts might be a tough fit into other types of shells...(i.e. CA parts into other shells, etc...)
--- are your gears worn? is your piston worn? Are you switching over to a bearing spring guide (vs. stock plastic TM one)? Are you switching pistons/piston heads? I'd keept the TM one if it's not worn out.
Those things...and others (nozzle/tappet)...might all add up to about the same cost as a complete new box and you'd avoid the headaches of rebuilding it from scratch bit by bit.
Anyways...if I had to get one right now I'd buy a complete mechbox (G&P or Systema), give it a check over for shimming, compression and FPS tuning...and just go with that. The old mechbox would go into the parts bin for later or I'd just give the parts to someone who needed them.
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