Aero has some simple/light ones around that $. Bear Creek has some for less $, just not sure how light or sturdy they are yet. I like a full length top rail and M-lok for other stuff....but that’s just because I use the top rail a lot. I do have a JP 12” that I’d sell for $100 with a new/unused barrel nut. It’s simple and slim/smooth. You can ad what you want, or keep it slick. Not sure if I have a section for the front sight. I might have an Aero 15” with a front sight rail section I can sell cheaper. I’ll check.