lock tight the piston head screw, watch the shimming, make sure the teeth to piston angles are good and they are fine for "general purpose" builds ... as long as your not trying to make some extreme psycho build (like 430+ fps and/or 30 some odd bps )
basically... follow all the standard gearbox do's and don'ts, and you should be just fine .. might be a little noisey .. but I've done a couple builds with em both 400fps and 330 fps .. and both builds have been through atleast 10K rounds now with no failures.
Vancouver Island Gun Doc, custom builder.
Leader - M.E.R.C. multi enviroment recon CAVALRY
The Cavalry Comes
"SIR!, you've gone mad with power!"
"Ofcourse I have, you ever gone mad without power, it's useless, no one pays any attention"