Good morning, JR! Please tell me whether or not 3rd generation G-21's and G-19's use the exact same factory slide stop? Now, does the Lone Wolf slide stop (extended slide release, or whatever) follow suite? By the way, thanks for your help with my, 'shooting to the left' problem. We found out what was going wrong; and everything's fine now. With the narrow front sight blade I'm using, a minuscule adjustment to the rear sight was necessary.