Bah humbug. I'm having problems with one of my gas mags.
I had broken the fill valve by over-tightening it. Luckily Fire Support sell compatible Guarder valves at two for a tenner (which makes the fiver postage feel a bit steep, but hey ho)
Anyway, I've just fitted that and tried out the mag again.
It's leaking 'bigly'
I've narrowed the problem down to two options:
1) I'm an idiot
or
2) I'm definitely an idiot
It's not the gentle leak of bad gasket or o-ring, it's the 'whoosh' of something missing entirely, or installed incorrectly.
I've watched the YT video about servicing this particular magazine, and I seem to have everything in place though.
The one area that seemed most likely is the knocker valve. If it's screwed in tightly it seems like the o-ring is exposed and it might not block the gas escaping.
Not screwing it fully in didn't help though.
I've also tested filling it with it without the spring + follower and top cover in place. The gas comes out of both the top gas hole and seemingly also the BB stack... which can't be right - it must be the gasket...?
Any thoughts as to how I've fecked it up are most welcome!
View attachment 115908
A - the BB stack, gas
seemed to vent from here, but surely it was actually coming from 'B'
C - the main gas route, also venting whether the knocker valve is screwed tightly in, or wound out (as per second pic)
Closeup with it screwed completely in... o-ring visible, is it only the hidden / lower side that needs to block the gas?
View attachment 115910
Assorted pics of the valve screwed out, then in...
View attachment 115909