Does switching uppers affect the zero on my optics
No since the optic is mounted to the upper itself. The lower has no real bearing on the point of impact.
Pat
That is pathetic accuracy from a dedicated upper. I would expect such things from a 1/7 upper with a drop in kit but not from a dedicated upper. Between this and the issues Shivan had with his upper you can count me out on these things.
Got to shoot my Spikes upper on Saturday. I have to say not bad. Don’t recommend using mags from Pro Mag. It caused repeated jams. My Black Dog mag worked flawlessly.