In Praise of the Colt 6720 (and 6520)

[ABNAK]

Just picked up a 6720 today. Mine is roll marked AR15A4 LightWeight Carbine. When did Colt change to the A4 vs A3? Is the only difference M4 feed ramps between A3 and A4?

I have a 6720 that I bought a few years ago that is roll marked "AR15A4 Lightweight Carbine" like yours so I don't think it's a recent change.

[Circle_10]

The Colt 6721 carbine is marked "AR15A3" IIRC. The 6721 predates the 6720 by a number of years. It has a flattop upper, 16" heavy barrel, and I think it had a 1/9 twist as well.
I believe it is out of production now.

[flenna]

The Colt 6721 carbine is marked "AR15A3" IIRC. The 6721 predates the 6720 by a number of years. It has a flattop upper, 16" heavy barrel, and I think it had a 1/9 twist as well.
I believe it is out of production now.

They are still in production.

https://www.budsgunshop.com/catalog/...rem556nato_161

[Circle_10]

They are still in production.

https://www.budsgunshop.com/catalog/...rem556nato_161

Ah ok, it's not listed on Colt's site currently. Maybe it's some kind of limited production item. Although they do mistakenly show a picture of the 6721 for the 6720.
https://www.colt.com/detail-page/clt...w-556-161-30rd

[Walker_Texasranger]

I have a 6720 but I'm kind of over short hand guards and FSBs so going to get something else with a LW barrel and 13" free float HGs.

The 6920 Trooper was a neat gun and I briefly owned one but it was way front heavy compared to my 6720. I hate gov't profile barrels. If Colt would do the exact same gun with the 6720 barrel it would be killer.

Kind of where I’m at. I had a 6920 that I put a Centurion C4 cutout handguatd on and cut the barrel to 14.7” with the A2 pinned. Looks awesome. But then with a red dot I’m like why? The FSB just gets in the way. Looks cool when not shooting but not as practical for actually shooting imo.

[ryanm]

https://www.budsgunshop.com/catalog/...rem556nato_161

Says 1 in 7 twist. Pencil barrel. Looks to be an A3 marked 6720.

Just read all the reviews, people are saying they received A4 marked rifles, not A3s

[Circle_10]

Maybe the 6720's roll mark was changed from A3 to A4 when Colt bright the 20inch AR15A4 rifle out?

[ryanm]

When it was an A3, I don't remember it being roll marked as light weight carbine but I could be wrong--it's been a few years since I looked at one at a gun show.

[Todd.K]

Too bad they won't make a midlength. I'm just too cramped on a 7" handguard, especially after trying to fit a light.

But yes to the pencil barrel.

[Pappabear]

I love mine, I paired mine with a DD RISII FSP cut out. Wicked nice. On that rare occasion I see one of those rails, Im always tempted to buy it and build another.

PB