Fixing a canted front site on an AR?

[THE COOP]

I have a DPMS upper and have had this problem since owning the gun but I need to fix, AR-15 DPMS upper in .223 and just finished a new lower build and noticed the sites dont look right, I always have to adjust the rear site all the way to left so I took a good long look today and the front site is canted a little to the left so whats the fix besides buying a new barrel and a upper? I had this upper totally stripped during my armorers course but didnt notice until now, Sugestions? Modifying the key on the barrel? Grinding the upper slot? Maybe going to a gas block but would the whole for the gas tube be off? OK ALL, I'm asking the experts. Thanks in advance!!!! COOP

[Guest 6.8 AR]

Take it off and use something like the Yankee Hill flip up front sight gas block. There should be enough wiggle room between the gas port and the block. It can't have been drilled off center enough to matter if you are noticing that little of a cant. It would be easier than playing with the key.

[R1100R]

It could be you have a slightly angled front sight post. Go by the Lebanon Armory. I think those guys carry AR parts and work on them. There are ways to adjust a slight cant.

I have "adjusted" many AK FSB with the method below. Seems to work for the AR also. lol

http://www.m4carbine.net/showthread.php?t=807

Edited April 16, 2010 by R1100R