Out of all of those I would have to chose the Army L85. Its a good gun for the price and over in the UK its like an M4 very common. Also whats cool about it is that no one owns one in the USA you would be very unique. The L85 accepts M4/M16 style mags although they may need a little electrical tape. The L85 mag well is only a little wider than the M4 mag well. Next gun ASGI CPW exactly what it says a CPW very small gun smaller then the M4 Commando and would be best in CQB but probably not good in the field because of the small barrel. Now onto A&K....... im not a fan of A&K my friend has an A&K M249 completly different from your gun but the problem with the M249 is that it stoped working randomly. The externals are fine and so is the battery and the fuse somebody is checking out on the internals but I haven''t heard anything on that.