I got three barrels for my RTI and one for my Mutant, I found some old PVC pipe I think 1/2 inch and cut to the length of the barrels , Oh I had to clean the pipe out with wd40 and rages on string worked great, taped one end up wrote on pipe with marker as to the barrel dropped the barrel in and stuffed the other side with cotton balls, Works great barrels are protected and lubed up in the pipe....
Mike
Mike