yes tm socom mk23 mags leak on propane. its an intermittent problem and doesnt happen on all tm socom mags. i posted this link before so i will do it again. its a pictoral/demo on how to do the repair.
(ps) kudos go out to "ibby" for showing me how to do this over 2 years ago.
http://www.airsoftcanada.com/showthread.php?t=44949