Hi everybody and thanks for all the replies. All my replies to you thus far have gone to the moderator for approval as I am a newbi but although other contributions elsewhere are now appearing unmoderated those to this thread seem to be AWOL, sorry about that.

It seems that CO2 is not the way to go according to the majority and I hadn’t given trigger action a thought. Some good mechanical options to look out for on the second hand market so that’s where I’m off to now, searching for that elusive bargain. I’ve found a FAS604 already but it is in Ireland and I’d much rather have a face-to-face.

Once again many thanks for taking the time to help this confused newbi out.

John