While doing research, I have only come across two makers of the 22 conversion for Glocks. Johnathan Arthur Ciener Inc., and Advantage arms. Im told J.A.C. is a crook with over 30 filed complaints to the BBB in the last 36 months, and Advantage is Cali based and can only do 10 round clips with their model. Can anyone give me the real skinny, and tell me if there is another manufacturer out there I might have missed? As we all know money is much harder parted with in this economy, and I need my purchases to really count.