I bought a Bushmaster A2 last weekend.  The rear sight appears to be loose and turned slightly to the left.  When I fired the rifle all rounds were left of the aim point.  When I rotate the rear sight elevation knob the sight tightens up and lines up straight on the rifle.  Is there any way to tighten the rear sight to keep it aligned with the barrel?

the rotated angle of the rear sight is normal.

Click for for details -
[url]http://www.armalite.com/library/techNotes/tnote18.htm[/url]

Thanks for the information and the website.  I feel much better about the situation.  I'll just adjust the sight to the right.