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Re: Piston 5.56 Rifles [Re: Endeavour Morse] #1038922 03/19/16 10:30 AM
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In 31.5 years of AR15 ownership, assembling, shooting, and trading (I've had a remarkably high number of ARs pass thru my hands) I've have yet to see or experience a single lower receiver failure. I did have an EXTREMELY low quality cast lower in the early 1990's that was grossly out of spec....but it still worked.

This is why I've sold my extra complete rifles. I bought two spare LWRC uppers as replacements for the couple of complete rifles I kept. I have no worries about wearing out the complete rifle lowers, but the uppers I could eventually wear out.


JYD #123 The great one formerly known as Architect.

I am now a fictional British television police officer (currently a Detective Sgt) at Thames Valley Station. My governor is Detective Inspector Fred Thursday and it’s 1969.





Re: Piston 5.56 Rifles [Re: Endeavour Morse] #1038923 03/19/16 10:38 AM
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OK. MY Colt AR15A3 Tactical carbine is as follows:

Marked Colt AR15A3 on the lower receiver. Below that is
SN BD002915 (only thing I can find is this/ BD000134 and Below - Pre-Ban (AR-15A3 Tactical Carbine - very rare model).

On the barrel is marked CMP (I THINK) and 5.56 Nato 1/9 Hbar.


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Re: Piston 5.56 Rifles [Re: Endeavour Morse] #1038924 03/19/16 11:10 AM
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It also has the flat top forward assist W/case deflector.

I THINK it is model 6721, but there isn't any other markings on it that I can find.

Oh and it does have the detachable carry handle as well.

Last edited by SkunkHunter; 03/19/16 11:17 AM.

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Re: Piston 5.56 Rifles [Re: Endeavour Morse] #1038928 03/19/16 02:31 PM
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I read your post again Gary and Mine DOES have a flash hider. It is VERY similar to this one, but the bottom side is solid with the slots only along the sides and top.

http://www.midwayusa.com/product/343064/dpms-flash-hider-a2-1-2-28-thread-ar-15-matte
AND mine also has the bayonet lug. JJ sent me a bayonet for it and the "Lock up" rattles a little due to the "Ring" being to large but other than that it fits nicely.

Last edited by SkunkHunter; 03/19/16 02:32 PM.

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Re: Piston 5.56 Rifles [Re: Endeavour Morse] #1038929 03/19/16 02:35 PM
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YUP, this looks like what I got. AND I bought it somewhere late 1994-early 1996.

The AR6721 HBAR model.

http://www.colt.com/Catalog/Law-Enforcement/Products/Colt-Tactical-Carbine
Click on the Tech Specs section under the picture.

Last edited by SkunkHunter; 03/19/16 02:40 PM.

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Re: Piston 5.56 Rifles [Re: Endeavour Morse] #1038930 03/19/16 03:19 PM
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I've had a 6721.

Your rifle is fine for someone wanting a HBAR DI. You have a very good Colt that would address most peoples' AR needs.

I'm not a fan of: Carbine length gas systems, HBARs, fixed front sights and DI guns. However, that's just my opinion.

ETA: if it works for you don't worry about it.

Last edited by Architect; 03/19/16 03:20 PM.

JYD #123 The great one formerly known as Architect.

I am now a fictional British television police officer (currently a Detective Sgt) at Thames Valley Station. My governor is Detective Inspector Fred Thursday and it’s 1969.





Re: Piston 5.56 Rifles [Re: Endeavour Morse] #1038931 03/19/16 03:24 PM
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Regarding the fixed front sight....

I PREFER them if I don't plan on using an optic. I always coupled them with a LMT fixed A2 rear sight. However, I equip all of my social rifles with an optic and UBER PREFER the uncluttered FOV of a flip down front sight.

Today's high end optics are of such quality and durability to actually render flip sights as true "back up" status.

Wouldn't own a rifle without METAL BUIS.


JYD #123 The great one formerly known as Architect.

I am now a fictional British television police officer (currently a Detective Sgt) at Thames Valley Station. My governor is Detective Inspector Fred Thursday and it’s 1969.





Re: Piston 5.56 Rifles [Re: Endeavour Morse] #1038932 03/19/16 03:28 PM
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If I planned on running an AR with iron sights only I strongly feel the best option is the fixed front with A1 Rear. I hate that Colt "upgraded" the 6420 from an A1 rear to a A2 rear and renamed it the 6520.

The super lightweight 6420 was the perfect DI KISS Carbine at 5.6#. The 6520 is the same but with unnecessarily complicated and more fragile A2 sights. I have no illusions of shooting 500 meters with the 6520's super LW barrel profile. Let's face it, the 5.56 has ballistic limitations anyway.


Last edited by Architect; 03/19/16 03:29 PM. Reason: Me spel'n stinkz

JYD #123 The great one formerly known as Architect.

I am now a fictional British television police officer (currently a Detective Sgt) at Thames Valley Station. My governor is Detective Inspector Fred Thursday and it’s 1969.





Re: Piston 5.56 Rifles [Re: Endeavour Morse] #1038946 03/20/16 01:45 AM
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Thanks for the info Gary. Yeah I figure that this will serve me well for MANY more years to come.


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Re: Piston 5.56 Rifles [Re: Endeavour Morse] #1039003 03/20/16 05:07 PM
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After training with them I will take static 45deg offset sights all day long over pop ups. As you said Arch less complicated (read failure points) and always ready if needed.


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Re: Piston 5.56 Rifles [Re: Endeavour Morse] #1039009 03/20/16 06:03 PM
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I've only had one set of 45d offsets, and didn't keep them long enough to form an opinion. I like the idea and should explore it further. I'd also like to try a 45d T-1 sistered with an ACOG.


JYD #123 The great one formerly known as Architect.

I am now a fictional British television police officer (currently a Detective Sgt) at Thames Valley Station. My governor is Detective Inspector Fred Thursday and it’s 1969.





Re: Piston 5.56 Rifles [Re: Endeavour Morse] #1039010 03/20/16 06:04 PM
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greaser, are your sights fixed or flip?


JYD #123 The great one formerly known as Architect.

I am now a fictional British television police officer (currently a Detective Sgt) at Thames Valley Station. My governor is Detective Inspector Fred Thursday and it’s 1969.





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