Tokyo Marui M870 Tactical Gas Tri-shot Shotgun- picture, text and video review

[Tokyo Marui M870 Tactical Gas Tri-shot Shotgun- picture, text and video review]

Cheers dude, I'll do just that.

[Tokyo Marui M870 Tactical Gas Tri-shot Shotgun- picture, text and video review]

I wonder if anyone can help?

I have a new Breacher, as soon as I load the mag into it, the gas leaks out inside some where. It's never been fired and the first mag had Abby 134a gas in and the second time I tried I used propane (as the 134 had run out). Never fired a shot, never been used. 

[Marui M870 Fix and Tuning Thread]

I've recently bought a breacher, had it for about 2 months before I got any gas to test it, finally had a go this weekend and as soon as I load the mag the gas just escapes out of the body of the gun. Never fired a shot, currently it's a £300 paper weight   I gas the mag and as soon as it locks into place I hear gas escaping inside, empting the mag in less than 2 seconds.

I've heard people say they leak if you use Green gas/ Propane but I've not actually ever used it, any advice would be much appreciated.