I bought a rifle listed as ar-15/ 5.56 a while back from a pawn shop. I have since learned my lesson. Turns out the barrel was converted to a .300 blackout and an aftermarket red/green dot sight was on there. After attempts at boresighting, getting risers for the sight, shooting and still not hitting paper, I tried to adjust where I mounted the optic on the weapon. This helped, as far as not moving my head, when I pulled the rifle up to aim. But after another boresight and attempts to sight in, I still could not hit paper. I know about trigger discipline, eye relief, and breathing and how they affect your shot; but cant seem to sight in this rifle to save my life. I've since bought a set of pop up iron sights, and taken off the red dot sight.
Does anyone see what I may be doing wrong?
Should I just stick to the iron sights, since this is more of a home defense gun, rather than a hunting rifle?
And if I can get the optics and myself to work together, should I keep both on there?