What is a reasonable paintball gun for a beginner?

I’m looking for a paintball gun for my brother, who is 16. He wants to get into it and I want to get him one for Christmas. Now we are experienced with real guns lol, we’ve grown up shooting 12 gauges and muzzleloaders galore so he has a lot of experience with actual guns/gun handling and safety.

I don’t want to spend too much, but want to get him something actually worth the money but I know nothing about paintball. Any help is great, thanks!