Dude man your asking too much out of your GBB. Is it brand new?
The seal on the slide + magazine is not making good contact maybe you need some silicon oil on the rubbers on the mag. Thats probably why its spraying everywhere. Remember always hold the GBB straight when firing.
On average, a regular GBB mag can only hold 60 shots of bbs.
My GBB with the metal slide will only lasts for 50 shots of bbs. Which is My TM HI-CAPA 4.3 with metal slide upgrade.
Your usp should be getting 2-3 mags shots of bbs max!
The propane adapter should always have the spraying noise while you fill it in the mag. It is just the design. It shouldnt be spraying liquid out but you can hear it spray and leak.
You should be holding the propane can in your mag until your mag starts spraying out propane like mad.
Theres nothing wrong with your adapter... It all happens to us.
As for bb's rolling out check out my thread about the 4.3 HI-Capa bb roll out.
http://www.airsoftcanada.com/showthr...hlight=bb+roll
Depending on the age of your gbb, the bb may roll out because the hop-up rubber is just screwed or theres too much oil in that area or dirt causing the bb to slide out.
I was having the same problem. You are putting too much silicon oil. Making the bb's just slide right off the hop up. Maybe you should take out the hop-up rubber and clean it with soap and water.