@Spence I finally got my AR pistol out to zero the EO Tech that I had moved. I stepped off 37 paces and got it dialed in to dead center. Then I went back to 200 yards. This is the end result of a 7.5" tube and a Krinkov can with military green tip ammo. Not my prettiest but the dot on the EO Tech is 4 MOA which is ~8.5" @200 on a 12" x 16" plate and the wind was blowing to beat the band.
As an example, this is what you can do with a parts gun.
Cheers,
Craig6