Ok AR experts I have a buddie who got a new smith AR15 sport. We put my old 3gun scope on it Burris 1*4 and can not get a consistent zero at 50 yards the rounds are all over the road using a sandbag for support. Thinking my scope was bad we remounted it on a old stag I have. And bingo 1/4 inch groups off the sandbag. So if the scopes good what are some things we can look for on the AR before sending it back to smith.
thx in advance
thx in advance