r/ar15pistol

These are my new Topo x Grip panels that I designed. They are stackable in a multitude of different ways. I designed them to be super versatile. They fit most m-lok rails with the exception of the chonky ones from aero and I'm sure there's other that I haven't tested they they don't fit. let me know your thoughts. These are SLS printed from Nylon 12 so they are pretty sturdy and can hold up to heat as well.

I bought my first AR back in 2020 and it came with the lower receiver you are in the picture. I have since stripped it completely down and rebuilt it. Any help ID"ing this lower would be greatly appreciated.