From personal experince with my old KJ M9 which was full metal I found it shot great on propane with no problems, however Duster is no where near strong enough to push out a bb at any decent FPS.
I have the TM P226 and absoultly love it, I would recommend it over any other GBB i have owned. However and if Stalker see this thread, he will agree, once you start screwing around with a GBB you open a huge can of worms. If you do get a TM one and put a metal slide, you will still need to use propane to get the bb out, its the weight of the slide that the duster cant move very well.
Anyways, thats my 2 cents for ya.
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