I would strongly suggest trying before you buy. the cocking on these is noisy and cumbersome, very much reminds me of the old Logun S16 which needs a "positive cocking effort" to ensure the gun is in the correct ready to fire position. I have had 4 different ones in my hands and they all have felt naff in my opinion. some owners have been too gentle when cocking and managed to jam up the barrel, this once resulted in a few guys having to strip one down on a picnic table
they were designed to run FAC power and Semi-Auto which I am assured makes them work much better, sadly, this is out of the UK's scope so really, the gun should have been left to those that can have and enjoy that sort of thing.
I would go for something along the lines of the Uragan, Vucan 2, Cricket or FX personally. Much nicer to handle