WE Luger mags
 

I just got 2 new mags from ehobby that can't seem to get off more then 10 shots. The mags should fire 15, but I only really get about half that. I lubed the gun, I put 2 drop throught the valve into each mag. I haven't pressed the big button, only emptied through firing. I started by filling for 3 seconds with propane, but that only gave me about 4 shots. I've tried 4 second and 5 seconds, the latter gave me 10 shots. I don't know what to do now.

Fill until gas comes out, or you hear it stop.

also, how full is your propane tank. if WE fill valves are anything like all the other china made gas mags (silent fill type) then there might not be enough pressure in the tank to force the propane into the mag.

if I have less than a 1/3 left, i can't fire an entire mag from my KJ m9 no matter how long of a warm up time, how careful i am with my shots.

Propane tank is about 1/2 full, I do have a full one in teh basement for plumbing so i'll try that too. Styrak - I thought that it was bad for the seals to fill it until gas comes out? I'll try it anyway and see what happens.

No, that's how you tell it's full, at least on two way valves like TM ones.
On silent fill valves that don't spew when full, you just stop when you don't hear it filling anymore.

are you shooting the gun outside? in this weather, dont expect to get many shots from any gas weapon. hell, i paintballed yesterday and my 20oz tank was literally getting half as many shots as it should have been.

With a 6-7 second fill, I can get off a full mag without a problem... The valve doesn't spew out when it's full like TM guns though, so there's no indication it's full...

I've been shooting in my house. I know the cold kills the gas guns.