AR upper lapping tool.

[Pokinfun]

I use aero person lowers with a set screw.
https://aeroprecisionusa.com/ar15-stripped-lower-gen2-anodized-black.html

 

[Gunbuffer]

Haha beastep I know what you mean.
i Wouldn’t call it bedding, but that’s just a word thing. it’s a known accurizing method. I used to do it with shim stock and freezing the barrel.