I’m not sure what I did wrong, or if I’m a dumbass.

My dad bought a new 2012 vintage 6920 and topped it with a Colt carry handle from Arms Unlimited Attached File


Ammo was Hornady Frontier m193 and hand loads using a Hornady 55gr bullet with 25.0gr of Benchmark.

I bottomed out the rear sight and adjusted it to the closest detent.  Initial zero was at 25yds using the front sight for elevation changes.

Backing up to 100 yards, it was shooting as high as you would expect.  Although not bad for irons and 60 year old eyes.
Attached File


The headache started when I tried to lower the point of impact.  
The rear sight was already as low as it would go.  And the front sight is now barely below the ears of the housing.  The carry handle is a 6/3.  Which should be correct for a carbine.

Attached File


Major struggle to get it adjusted to where these two groups ended up.

Did you have any difficulty with windage adjustment?  If the front sight is canted, it will lower the front sight post, making it shoot high, but it would also require a lot of windage adjustment to bring it in line.

Your front sight should have an "F" mark on it.

Check the carry handle for markings. Colt will have a forge code. USA manufactured will have a forge code. Made in China won't have any markings.

I think Bushmaster or DPMS makes a taller front sight post.

You can measure the rear sight base, US GI is .840", commercial handles are .800". You may need a commercial handle.

Front sight is F marked
Carry habdlenis square forge marked