Help with hi capa discharging gas...
 

ok, this hi capa was shooting fine on HFC 134, but I ran out so I thought id use propane (DUMB), well it ended up shooting and blowing back very hard, but the slide only went halfway forward after I took one shot on propane, now I got some HFC 134 and went to use that, but when I pull the trigger, all the gas discharges out of the mag, so whats wrong, new o-ring ? I dunno, please help, thanks.

check to make sure your o-ring is seated properly. It may have blown out of place when you used propane.

tiger
talk to Jasper he'll know for sure, since you local he could probally fix it fast