Yeah, these were 45 flip sights. They were all metal, and easy to sight in. They just are not precision sights. And had slop in the design. But my (former RECON) buddy loves them on his sub. His factory sight was adjusted all the way on windage, and it still wasnt on target. But with the 45 flipped down, you get a low profile. And push 2 buttons and you have real iron sights! So he thinks the new sights are good enough.
^ There's several choices of integrated 45-deg. flip-ups now.
As with you, though, I'm not well-versed with them...with my limited knowledge of them, I can't fulfill the OP's request for a lower-priced set, particularly with known durability/reliability being a part of it, too.