Thanks for all your suggestions on my 6720 that shoots 5" to the right @ 25 yards. I took an unused carry handle sight from one of our Colt M4's and tried it today. Unfortunately, the gun is still shooting 4-5" right at 25.

I called Colt and explained the problem. I was told to mail it back on my dime, and that I would have it back by mid March of 2011. Colt must be really busy if it's taking them 3 months to do warranty work.