Evike.com Moondog Industries Universal Gas Fill O-Ring Set for Airsoft Gas Gun Magazines (Color: Red)

"someone finally made some of these. propane hurts the original rubber seal real fast. the material is really soft though. a sharp toothpick or needle easily pierces through it. i recommend breaking the tip of the toothpick to get a duller round end. even then the seal is mushed in when install. kinda looks like puddy when installed. make sure you get it in as much as you could or you risk blowing it out when you try to fill it. once in though it seems to hold up very good after i tested a couple of fills. only time will tell if these are better that stock rubber o seals.

GOOD:
- replaces bad or lost o seals. couldnt find anyone else selling these.
- several in one pack. able to fix all my mags.
- dont have to buy expensive fill nozzle with rubber o seals that fail quickly.
- does seem to hold up so far...

BAD:
- improved material is too soft. seal is smushed in. instead of slipping over.

"I bought these O-rings for my brand new Walther PPQ, because it was leaking. So when i finally got them they would'nt even fit because they were too big. I bet these would work amazingly for other guns, but not for mine.

"Not a fan. First they're so bleeping small that they're hard to hold onto, especially with any silicone oil on the valve. A certified bugger to try to slip over the end of the fill valve! I tore three of them. If you can get them in place they seem to work as advertised (for now after 1 or 2 fills) but I think a little more development is needed. A slightly larger version would be a thought.

"I got these rings when my GBB magazines were leaking on filling. After installing them, it solved the issue.

Now, I'm trying to install them on my S-Thunder grenades, and they WILL NOT go in. The shells came with no rings, and I thought it was nice I had 4 more of these rings to use up, so I could use 2 more on these grenades. Well, think again, EVERY ONE OF THEM SNAPPED.

They are not a be-all end-all solution to fill valve o-rings.

Pros: Good, if they get installed

Cons: Bad that they cannot be installed.

"the O-rings tend to slip out of the valve..

"Ive tried putting my review on these through a few times. Never makes it...

Anyways.
These things are good if you can get them in good, but its really hard. Some leaks are not fixable with these even if you do get them in solidly. (Most are though)
I had a leak on my WE Hi-capa and the leak required 2 o-rings to stop the leak.

Expect to rip 2-3 of them trying to figure out how to get them in to the fill nozzle.

These are great if you can get them in the valve perfectly. Otherwise they are worthless. Its only $5 though. Pretty good

"These new o-rings are just as bad as the old ones. Still keep falling out of my SVD mags. Waist of money.