Any inner barrel can be used. I can give you the stock KJW M700 barrel if you want, although it's not the best of quality. I can get you a quote for the shipping sometime also. I had a buyer for the barrel, but payments kept getting pushed back and I haven't heard from him so it's up for grabs!Is this the outer barrel that comes with an special inner barrel or can any be used(Not sure if its this or the tapered heavy weight).
If it able to use any inner I'm interested, depending on shipping costs to the uk