User blog comment:Bovell/E3 coverage of Battlefield 3./@comment-70.24.91.67-20110611174638/@comment-3479148-20110611202725

Actually, the way it works is: You have an ACOG, and a back-up sight on top for close encounters. Some guns have a smaller red dot sight on top of the scope.

You guys should really try to play some Arma, it gets you in the right perspective when it comes to guns.

Also, interesting tidbit, Russian snipers in Stalingrad often had elevated scopes in order to access the iron sights for closer engagements.