RB Models' T 72 AM Barrel Assembly Help

Many thanks guys. That will definitely help.

This in on the RB website. Kind of instructions there. 

http://www.rbmodel.com/picture.php?dir=35B102

I'm not familiar with that exact tube, but on my T-62 I used an RB Barrel and it came with a few PE parts that were for the fore and aft ends of the bore evacuator and another couple for the searchlight attachment. Study some close up photos of the real tube if you can find some and see what the PE parts are for. You may be able to tell by looking at the kit tube as well. Not much help I know, but that's my advice.