I have an AR with 16" 1-7 , free floated barrel with a red-dot . It shoots well at 50 yards about 4MOA = 2" groups at 50yds. I wanted to find out how accurate the gun really was so I put a scope on it and tested it out . I shot PMC , x193 , Privi , some kind of winchester all 55gr and I had some 77gr federal gold metal match . All the 55gr stuff was around 3MOA @ 100yds ( thats with a 3-9x40 scope
)but the heavier match stuff I could shoot just about 1 MOA with .
IMO if you want to find out how accurate your gun really can be you will need to get some good ammo . 55gr and up should be fine for your rifle but the heavier you go the better it should be .
There is one other thing . If you have a stock mil-spec trigger you are going to have to really concentrate on your trigger pull . they do not lend them selfs to accurate shooting .
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