So I thought I'd drop a little thread here to hopefully bring some notice to these little O-rings being offered by a fellow member here.
These things are great. I slapped them on my G17 TM mags and it removed all sound (except a slight filling sound if you listen closely) and gas spillage. Very easy to install, and well worth the EIGHT bucks for eight orings. Now the people around me don't have to breath in copious amounts of propane fumes when I gas my Glock mags.
These were well worth it, and if you have TM mags I highly suggest you pick some of these up.
You can head over to his sales thread here:
http://airsoftcanada.com/showthread.php?t=169381