Originally Posted by ACM73
I use my ALS designed for the 17/22 for both my 22 and my 19 and it works just fine. You probably wouldn't be able to use the smaller version for a bigger gun, but the bigger version works just fine for the smaller gun.
If you look closely at the bottom of the ALS bucket, you should see a plug that holds the muzzle. It keeps the gun from tilting in the holster and causing problems for retention. If you put a 19 in a 17's holster, that plug doesn't get engaged.