Danman,
certainy wasnt trying to poop on your thread. I would jump on one if you could get it for the price of used 22s.
Did not know the Gen4 21 was the same as the 21SF.. I thought the rail on the SF was different also, but cannot confirm.
I think though, with all the battery operated zip guns on this board, if you could find a good group buy on quality CR123 batteries, we would be all over them ??
Missed you today and I hope you got a doctors note ;-)