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Posted: 10/21/2004 2:01:49 PM EDT
Hello all,

I was wondering the other day why Colt does not make a flattop carbine utilizing
the government carbine (6520) barrel. SO, I decided to make one for myself. I notice
that the 6520 barrels don't have the F-marked front sight. I was wondering what the
implications are of putting the 6520 barrel on a Colt M4 flattop upper. I know there
are sight height differences, but will this combination work together?
Do I simply need to get a taller front sight pin? Or what?

Thanks in advance for your kind responses,

Mark Papineau
Loveland, CO
Link Posted: 10/21/2004 2:05:38 PM EDT
There's a difference of about 0.040" higher in the F marked front sight tower.
Link Posted: 10/27/2004 8:13:53 AM EDT
So, in other words, don't worry about it?

Link Posted: 10/27/2004 8:32:28 AM EDT
I bought a .040" taller front sight post from Bushmaster when I installed the ARMS 40 rear BUIS. I found that the front sight post on my Bushmaster was out a little too far when I cowhitnessed.

I also have a Colt with the fixed front sight tower. Like I said, there's a .040" difference. Some people don't have a problem with adjusting their standard front post up. I just didn't like the base of the sight post being almost passed the spring loaded pin. Plus it wobbled a little when I touched it.

Just personal prefference.
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