Any advantage to more expensive lowers?
Thought the lowers were pretty much all the same
A higher chance that the mags will drop free, pin holes will be in the right spots and at the right angles, built out of the right material, anodized the right way and threaded holes threaded all the way.
These are all common problems that pop up on forums. They are not all built by the same company with different roll marks. But if you get a bargain on one that's built right, it'll work just fine.