Alright, long story short, my girlfriend ended up buying a bunch of AR parts from her friend's ex-boyfriend before they broke up.
I'm putting it together for her now, and her handguard doesn't have any sort of branding on it to identify where it came from, and it's missing the anti-twist screws that clamp the handguard around the barrel nut. I suppose they're not exactly needed, but I need them.
I took it into Home Depot today and tried basically every cap screw I could find and couldn't get one to fit right. There are so many threads/posts online about handguards, I can't figure out if there is a standard thread pitch or something for handguards, but I assume there isn't.
Does anyone have any ideas for me? Perhaps you could identify this generic looking handguard for me.