WE luger gas leak

[spitfireace1]

hi can anybody help please i have a WE luger and think the gas

is leaking i can only get 1or 1.5 mags per fill

and gas seems to vent from top of gun.

1, can mag be fixed

2, is tanaka mag compatible with WE luger

3, WE sometimes double feeds

4, how do you know when gas in mag is full

dosnt overflow.

has anybody else had similar problems

PLEASE help please pm me.

in advance

many thanks