I own two Bushmaster AR15s. One is a short M4 lookalike, and the other is a long rifle. They are A LOT of fun to shoot. The ammo is so cheap you can go out and plink and target shoot all afternoon for $25.
The only thing I don’t like about them is the cleaning after a day of fun. They DO NOT LIKE to be dirty, and they have a few small parts that take a good bit time to clean.
Yep, I own two Bushies, in pretty much the same configuration as you do, so I understand the experience.