[bobgengeskahn]

I have one in my ASR... I did this though... .30c of brass dowel and a set of files I still use:
http://www.filakairsoft.net/index.php?showtopic=733

Edit:
People forget that there are Filipino airsofters, but their community is HUGE and they have a lot of good stuff, like this:
http://filairsoft.com/forum/forumdisplay.php?f=110&order=desc