I agree entirely re the SIG rifles. I have played with a couple at the club and they have a tendency to jam. Also quite low powered and inconsistent for what they are. I don't like the idea of the larger and more expensive CO2 cylinders either as starting a session with one kind of commits you to emptying that cylinder before you leave the range or certainly to within a couple of days of fitting it. Fitting an adaptor for a pair of standard cylinders is probably better but there's also the aspect of more expense...
I have just taken the baffles out of the Parker Hale silencer I experimented with in order to reduce weight and this has resulted in the pistol shooting around an inch and a half high rather than the 2 1/2 inches high it was shooting with the silencer fitted. It also feels more pointable as a result. To be honest, even without the silencer, the pistol shoots accurately enough when I place my sights over the target area and the fact shots impact slightly low mean nothing to the tin cans and fairground skittles I have used as targets.
Kind regards,
John