I just picked up a G19 s/n FW1xx this morning. It's in great shape. Still has black internals so I don't think it's been upgraded and has an uncaptured recoil spring. It has an old extended slide stop. Can anyone tell me if the slide stop is a factory part? What would have been factory for this gun? Also, it has a stainless guide rod. Any idea where I can find an original uncaptured polymer one? It didn't have a box or papers. I'd like to find those too to make it complete. Any suggestions on where to find old parts would be appreciated. Glad to have this one. My first gun was a G19 Gen 2. The G19 is my favorite gun and I always regretted letting it get away. This one is interesting because of it's age and the proof marks. Thanks!