I have a number of metal gun barrels for sale.  Designed as replacement for kit barrels to give your model a much better look as well as being more robust.  

Also have some resin castings. These are provided in the unfinished condition and are cast in high quality polyurethane resin. They can be drilled, cut and sanded with care.  When working with any type of resin, care must be taken since the fine dust produced with sanding can causes irritation.  We recommend using wet sandpaper to avoid this problem.