Is it normal for GBB mag to be leaking silicon oil?
 

After 2 games, I stored away my pistol with probably less than half charged propane + silicon mix.

I opened the case today, and found both mags has a bit of silicon oil at the bottom where 2 pins are holding the air nozzle unit. (at least that's what I'm guessing it is, since I didn't open this thing in a week)

At the game I did drop a bit too much silicon into my propane tank because I was impatiently waiting for someone to come to the airsoft field and hand me a spare key for my car..I left my damn keys in my trunk when I forgot to take my pistol with me..Silly me.. :banghead: Probably the most forgetful person.

Is it normal to have a bit of silicon coming out?

Now, I wouldn't say it's normal, but it's not as much concern of its leaking gas. That being said, you might want to check seals of everything on the mag; pins, o-rings, valves. I just don't like the idea of things being leaky. Better catch it before something gets worse, right?