I've had a TM px4 that shot well out of the box. Polymer body, nice weight, fits my hand. I mean, on the dot accurate. Then i realized the hop-up was off.
I was wondering why my shots were dropping off faster than other people's...
WE's externals are pretty good but nothing beats stock TM internals.
Duster and green gas are essentially the same as propane, minus the smell. It's only a few fps lower than regular propane.