I'm about to pull the trigger on a new Colt 6721. It's the HBAR version, one of the few still legal to purchase in my state.
I've shot one of these, albeit a well-used one about 10 years old, I think, and I liked it. I even liked the heavier barrel.

I'm mostly a target shooter.

Any reasons why I shouldn't buy this particular rifle? Any comprehensive published or video'd reviews available?
Any ammo recommendations?

Thanks!

Its a Colt, and its legal in your state. Why not?

If you don't mind the extra weight, it's a fine rifle.

I like mine except the 1/9 twist barrel.  Not that big a deal though.

hbar, 1/9 twist is awesome and should print some great groups.  Forget the nonsense about weight from some, most of these people are shooting from a bench anyway which makes it more hysterical imho.  You won't have any problem stabilzing 95% of the stuff out there

pull the trigger, have fun

1/9 is more accurate... By the mils original testing over 2x more accurate w 193 and 855 than a 1/7. It will last longer too as less rotations = less friction. Whats not to like? Unless you shoot 77s exclusively or tracers, theres no advantage to a 1/7 at all.

Buy it.

As a fellow subject of the People's Republic of Maryland I recently made the same purchase.  I'm extremely pleased with mine.  I put a Vortex Strikefire red dot on it.  The range where I shoot most of the time is bench only, so I changed out the handguard for a Magpul with a rail and added a Grip-pod.

So far I've shot mostly Federal American Eagle 55 gr FMJ and I'm really pleased with the accuracy and the operation of the rifle.  I really don't think you can go wrong and our exalted legislators may figure out that they left some huge loopholes in their historic assault weapon ban and add hbars to the list at some point.

Here's mine:
http://i178.photobucket.com/albums/w253/Clump63/AR15/IMG_1766_zps60a5f103.jpg

If the balance issue is bugging you...add a A1 or A2 stock with cleaning kit, or the Magpul UBR if a tele stock is mission critical. The Colt 6721 was one of my first modern ARs.   Mine was made even better with an A2 stock , getting rid of the ridiculous knobs on the carry handle, and adding M4 handies to the piece.  This weapon instills confidence, just with the way it feels....so go out and beat up the universe !

Not mine but member Molon's review on the Colt 16" 1/9 twist HBAR barrel using a free floating handguard and precision hand loaded ammo.

Quoting Molon: "The barrel on the Colt 6721 is the most accurate "off the shelf" chrome-lined, NATO chambered AR-15 barrel that I've tested."

Here's the thread link: (see page 2)


http://www.ar15.com/forums/t_3_118/486023_Accuracy_Evaluation_of_a_Colt_16__Light_weight_Barrel.html&page=1




Here's my 6721 made in 2010 with small standard size FCG pins and tactical modifications.

My Upgrades:
Knight's Armament Co. KAC M4 RAS rails
Magpul AFG1
Magpul XTM rail panels
BCM extractor spring upgrade kit
BCM GunFighter mod 4 medium latch CH
LMT ambi selector
Magpul MIAD grip
Vltor IMOD stock
Troy old model folding rear sight
Aimpoint on LaRue cantilever QD mount
Surefire M951C weaponlight
Blue Force Gear Vickers VCAS two point sling
Magpul PMAG

Knowing nothing about Maryland's laws - am I understanding that HBARs are legal?  

Do they have a specific determination of what constitutes an HBAR or not?  

Would it be possible to use the RO921HB (Heavy Barrel), otherwise known as "M4A1 SOCOM" profile barrel?  

It's a little bit lighter than the 6721's HBAR, as well as a 1/7 twist.

::shrug::

While it's not my preferred barrel profile or twist, for what you're asking about, the LE6721 should serve you just fine as others have pointed out.  

~Augee

I have sold a lot of 6721's to Maryland dealers this year.  The way I understand the law, if the gun has a heavy barrel, and says HBAR, it is still legal in Maryland.  They are buying those and VZ58's. It has caught on, Colt is out of 6721's right now.

Yep. HBARs only. Everything else is illegal. That is only by a loophole which says Colt Heavy Barrel Sporter models are still legal.

Had one during the ban days.  Extremely accurate with 55 gr FMJBT.

I'm not a lawyer, but I've done a bunch of homework on this ridiculous law.  You could replace an existing barrel with that and be OK.  You could use it on a lower that was already owned and be OK.  At this point I don't know of a way to buy a lower in MD, so new builds are pretty much impossible.  There are also a lot of questions about 80% lowers that would make me really nervous if I was going that way.

About the dumbest law I've ever heard of.

Sorry for the thread-jack, but there is some high entertainment value here.

It gets even dumber:

Before the "ban" "assault weapons" were considered as regulated firearms and fell under the same restrictions as handguns.  You had to complete the State Police paperwork and have it "not disapproved" and a 10 day waiting period.  After the "ban" the rifles that are still legal became unregulated long guns and are cash and carry, including purchasing from another state, perfectly legally.  So they actually made it easier to get ARs, but HBAR only because obviously that lighter barrel is much more dangerous.

The new law has a 10 round magazine limit, however you can purchase magazines in any capacity in another state and freely bring them to MD.  My 6721 included the 30 round mag, because I bought it in another state, perfectly legally.

I don't know if they will ever figure out these tractor trailer sized holes in their "ban".  Sure hope not.

My thoughts would be if you don't want them to figure out their "loophole", stop talking about it.

Yup, it's pretty darn accurate.   Here's my review of mine:

As I have been told directly from a person from the Maryland State Police, ANY AR-15 with a heavy barrel is not regulated, unless it is Bushmaster brand (for whatever crazy reason).

I have a few questions while awaiting delivery of my 6721:

1. How high a scope/red dot mount is recommended so the sight(s) are not interfered with visually by the front post sight?

2. Any recommendations for mounts?

3. I might want to replace the fore end with one that has rails. Since I don't have the rifle in my hands yet, I'm wondering how long a fore end is needed. From the photos I have seen, I'm guessing it might be about 7".
Will a replacement fore end be on the same level as the top rail already mounted on the rifle?

4. Any recommendations for fore ends? I'm looking for mid-range pricing.

5. I might want to get rid of the stock post sight/gas block assembly entirely and replace it with a different gas block and fore end assembly so that the fore end extends more towards the muzzle.
Is this a "big" job that I need a gunsmith to perform? What fore end/gas block combinations will work without a lot of fussing on my part?

6. I presume this is a "mil-spec" rifle, but the Colt site doesn't indicate it.

7. I downloaded the Colt "user manual" from the Colt site. Looks like Colt had the office boy Xerox a printed manual and he didn't bother to make sure the pages were in the copier straight.
Can anyone recommend a good manual on the care and feeding of my new rifle?

Thanks. I'll bet I'll have more questions later.

~Augee