Just got my first TM pistol, a second hand HK45 and struggling to get the mags to fill properly. I'm using a can of WE green gas with plastic nozzle (will be getting a can of nuprol 1.0 once this one's empty), have tried finger on knocker to start with to purge any air locks, tried longer holds and short 1-2 second bursts but the best I've managed to get is enough for about two thirds of a mag then it's empty.
I know these gas out slightly while filling but they're pretty much just spitting liquid out straight away, only thing I'm wondering is if the nozzle of the can isn't going deep enough, are some brands better to use than others for TM?
When it does shoot however, it's great with consistent, accurate 45-50m shots, so I'm more than happy with that.