Haven't been here for awhile, life, kids, work sure keeps you busy!
Just picked up a Sig 2022 in .40cal , thought I would show the difference between the two. the extended barrel is to meet Canadian Regs (Barrel must be 106mm or longer)
Both are in .40cal and have a polymer frame, both use the same mags and appear to use the same grip. The slides appear to be identical. The main difference are in the polymer frame. the 2340 was the predecessor to the 2022 and used a Sig designed rail as opposed to the standard rail on the 2022. The frame on the 2340 is made in Switzerland and the 2022 in Germany (still want to say West Germany, but I date myself)
This 2340 is DAO and I believe it was a police gun from the Quebec police force. The 2022 is DA/SA. The 2340 trigger pull is looonng but very smooth, the 2022 is similar to a 226. However the reset on both is considerable.
The 2340 shoots well, but the trigger takes a lot of getting used to, I am told it's similar to a revolver DA trigger. haven't had a chance to try out the 2022 yet. As for holsters, my Tagula Pancake for the 229 works and I will get a Serpa for it from fleabay. I see Fobus and others make holsters for it as well. A interesting feature for each pistol is that the hammerbox is removable as a unit.