shooter. about 3 weeks ago,me and a friend went to sight in his new bushmaster M4, He is an exp. shooter andat first he was all over the target , and no consistant groups it was hard to even suggest adjustments, after about 200 rounds it all started to come together good 1" groups at 100yds, open sights. It just took awhile for him and the rifle to break in. I also shot it, and by the end it shot groups as well as my A3 20". Good Luck.