Bowden Tactical AR-15 Upper receiver Review

I compare Bowden tactical to 2 different kinds of Aero Precision uppers.

https://bowdentactical.com/product/billet-upper/

Spikes lower receiving hole 0.499 for aft pin extrusion
Spikes upper aft pin extrusion 0.493

Cmmg lower receiving hole 0.500 for aft pin extrusion
Cmmg upper aft pin extrusion 0.494

Aero precision upper aft pin extrusion 0.495

Bowden upper aft pin extrusion 0.479