(20 June 2012, 00:06)Timelord Wrote: With my 2ndhand knowledge, I believe that particular design classifies it as a firearm!! Due to the fact it shoots a projectile from a tube/barrel. Someone might be in hot water soon by importing those particular goodies!! remember that ignorance of the law is no defence in this country!! 
Barrels are a good idea/design but they add a different set of ballistic interference issues when coupled to a crossbow design. Is that prod a strip of springsteel?? If so, then it may in fact have one excellent feature!! Everything else I suspect might be not much better than a BB gun. Close inspection is the only answer.
Hahaha better get in quick then
Well just to point out they are in fact classed as shot down a tube rail making them legal for the UK, look up Talon crossbows they shoot balls been around a long time in UK market.
As for build I would have thought you got it about right going by my Venom I have here.