Originally Posted by clr8ter
So they haven't changed the top of the receiver for '13? The carry handle is universally the same?
The Colt 6920 rail is the same for 2013 so any milspec height
carry handle will fit and zero properly with the front sight. Unfortunately there are comspec height
carry handles that fit Bushmaster, ArmaLite, DPMS, RRA, Olympic and others that don't have milspec height front sights. You definitely want the milspec carry handle that Colt, S&W, BCM, Daniel Defense, Noveske, PSA, Spikes and others use. The milspec front and rear sights are 0.04" taller than comspec.
Sorry to throw a curveball at you but it is important. If you do a little googling you'll see the steel protective ears around the aperture of the milspec handle stick up a little higher than the comspec. I'll see if I can find a link. (BTW, almost all quality third party flip up rear sights are milspec height.)
Here's more reading on it...http://www.ar15.com/forums/t_3_118/424705_.html
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek