Rifle Scopes Yea another noobie Leupold 6.5x20x50 any good

    I found a Leupold Vari X III6.5x20x50 long range. I am new to ARs and havent done much shooting over 100 yds. Is this type of scope usable on an AR platform? (I have a Bushy M4 .223 and and a S&W MP15 M4 in 5.45x39) both have front sight post and removable handles. If it will work, what kind of...