QUESTION: Glock 19 Gen 3 Slide Replacement Options

Hey all. I recently purchased my first Glock and so far I love it! The only thing I really want to change out is the slide because I want to add a red dot.

Normally I’d leave it stock because I really like it, but with iron sights I’m cross-dominant (Right hand, left eye), but with red dots I can shoot pretty well with my right eye. I was just wondering if yall had any suggestions.

Also I’d prefer a slide that doesn’t come with a barrel cause I live in California so I can do threaded, plus I’ve already put 500 rounds through my current barrel and it’s great.

Thanks!!