cmryan... Looks like you are new here. Welcome abord! Here a link to another forum [hope it isn't a rules violation] and it shows a lot of good step by step information on getting inside your tank and doing some of the cosmetic mods to make your tank more accurate. The FAQ section here is also very helpful. This will help getting the outer barrel off to work on. I have read of a couple people cutting the outer barrel to lengthen it while the tanks was still assembled and while doing so cut into and ruined the inner airsoft barrel, so I don't know if I'd try it. I guess you could do it with a fine hand saw, and imagine they were using a high speed Dremel cutter of something.

Once cut the metal extension piece looks like it should slide in. The knurled ends should hold it in place and a few drops of super glue would probably be a good idea. Here's a pic showing what the barrel should be and where to cut.
Hope this helps,



http://www.rcgroups.com/forums/showthread.php?t=743482