This is the exact one I got. Mine did not have iron sights or an A-frame sight at the front. This is probably more for people who want to do more customization, it comes stripped down (and thus cheaper).
https://gunprime.com/product/smith-wesson-mp15-sport-ii-optics-ready-556-nato-16-30rd-black/
Here's the "standard configuation" of that rifle, though. Note the A-frame sight on the barrel. Will also have flip up sights at the back to line up with the A-frame.
https://gunprime.com/product/smith-wesson-mp15-sport-2-ar-15-556-nato-16-30rd-black/
Here's another A-frame version with a cooler handguard, allowing for M-lok standard attachments:
https://gunprime.com/product/smith-wesson-mp15-sport-ii-with-magpul-moe-m-lok-10305/
I'd do some research. Youtube is a great resource, actually. Actually, here is the website that kicked me off on my learning. Very good, very thorough base. This is the resource that got me interested in the rifle I ended up getting:
https://www.pewpewtactical.com/best-ar-15/
^ You see there it lists best rifles across all price points very early in the article and mentions the Smith and Wesson MP 15 Sport 2. Also the Aero Precision, I've heard Ruger 556 is good, but those maybe you can't find for as good of deals. Those are mid-tier rifles along with the Smith and Wesson MP 15 Sport 2, but you can get the S&W for bottom tier prices right now.
A lot of that website gets very in depth, but it's great as a starting point, really. If you need to save time, make sure you check out the bottom where he names the manufacturers by tier, and then gives "Specific recommendations" by price point.