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Old September 14th, 2019, 11:33 PM #101
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The best /// show ever.
Fixed.


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Old September 26th, 2019, 09:58 AM #102
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One day I will pony up the money for Colt firearms.They are the standard Ar.I collect calibers.It keeps me busy.Iwould enjoy learning to reload.

Our hobby has so many avenues for knowledge.I enjoy all my brothers on here.Thanks, for the education.

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Old October 3rd, 2019, 07:30 PM #103
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Just checked my 6920HBPW and the upper has the square mark but no "C" or cage code. It has the m4 in front.

Also has the H buffer so it looks like I'll make a call to get the H2 buffer.
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Old October 3rd, 2019, 09:41 PM #104
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The HBPW came standard with an H buffer.
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Old October 3rd, 2019, 10:08 PM #105
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The HBPW came standard with an H buffer.
Great...thanks for the info.
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Old October 3rd, 2019, 11:18 PM #106
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Post some pictures of that puppy. I don't think most folks know about them. I'll post a few of mine over the weekend.
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Old October 4th, 2019, 01:05 AM #107
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Post some pictures of that puppy. I don't think most folks know about them. I'll post a few of mine over the weekend.
I should have taken some pics while I had it out. Since it's going to be sitting, I've made it extremely inconvenient to access. When I get in my stash again I'll snap a few.

My son got one about a year ago and his has the keyhole/C combo. Its interesting to see the differences.
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Old October 4th, 2019, 10:45 PM #108
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This thread came to mind the other day. A guy I know was moving and wanted out of his small gun collection. 80's Colt AR15 with the 20" HBAR, .223 only, came home with me for a song. Unfired but no box.
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Schweet!! Post some pictures of that jobber please!
Been a while but here it is. Pretty sure its unfired. Not a full auto BCG. No factory muzzle device but the previous owner gave me the flash hider it came with.
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Old October 13th, 2019, 11:28 PM #109
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Schweet! That was made between 1985-89. It should have a peel washer and an A2 flash hider. Get those put on there and you're golden. Good for you buddy!
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Old October 14th, 2019, 12:55 AM #110
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Up next is one of the last 6721's. In case all the various model numbers confuse you (they sure confuse me), the 6721 was the 16" heavy barreled semi-auto carbine. Production ceased sometime in 2017. If you look back to the beginning of this article, the first three we looked at were earlier versions of the 6721. Over time, these changed in many little ways ranging from quickly noticeable things such as stocks and handguards to barely noticeable things such as markings. At its core though, the 6721 stayed essentially the same; that is to say a collapsible stocked 16" heavy barreled carbine with M4 cut feed ramps. Let's take a quick look at this one.

First up is the left side:



And the right:

Notice there is no carry handle. That's how it left the factory. By the time this carbine was made (probably in 2016), Colt had stopped supplying carry handles because most people were chucking it in favor of mounting optics on the picatinny rail anyways. So why not save a few bucks and delete it? Instead, you get a Magpul MBUS rear sight. It works just fine I guess but I prefer a carry handle. You have to remember, I'm old. An AR is supposed to have a carry handle.


A closeup of the left side of the receiver:

Note that the serial number is engraved instead of stamped. There is also an engrave Data Matrix thingee (Some folks call it a QR Code I think) behind the "COLT DEFENSE" mark. I guess it contains information such as the model number, serial number, nuclear missile codes and stuff like that. It's just gibberish to me.


Right side:

The "C" on the upper receiver is stamped. Earlier upper receives had the "C" cast into them so they were raised. Another detail that differentiates these later models is the front takedown pin is actually a moveable takedown pin instead of a screw as seen on earlier models. "FIRE" and "SAFE" are stamped and not engraved. You can also just make out the nice staking for the buffer tube castle nut.


The stock is a typical late model Colt "waffle" stock. I say "late model" because, while this design dates back to 2002, the details changed over time. Earlier versions had no markings to speak of but late ones have both Cage Codes and a medallion blank spot. A what?? I'll show you in a second. First up are the Cage Code markings:

We're looking at the right side of the stock where the length of pull adjustment lever is. the number in the front, 4U486, tells us that it was made by P&S Products Inc. in good ol' Lexington Kentucky. It's hard to make out but to the rear of the P&S Cage Code we see Colt's Cage Code, 13629. Soooo, we knw who this stock was made by and who it was made for. YaY!!! Knowledge!!


Towards the far rear right side of the stock, we see a large circle molded into the stock:

This is the medallion blank spot I was talking about. When you look at some AR-15's sold/made by other folks (Ruger Smith & Wesson, etc.), you'll see their logo in this spot. I assume P&S sells to other companies as well and will remove the blank circle from the mold and replace it with logo is required for that contract. Earlier waffle stocks lacked both this round blank and Cage Codes. I don't know exactly when these stock attributes started showing up but it can help determine whether or not your Colt carbine has had its stock replaced. I wish I could give you exact dates BUT Colt is pretty stingy about sharing information. All I can tell you is that earlier waffle stocks should lack these features. You just need to learn through experience.


Here's a closeup of the Magpul rear sight:

It's well enough made and it even has two sized of aperture but it's plastic (sorry....polymer) and I'm old school. All bias aside, it works just fine.


Detail shot of the upper receiver markings:

Remember, earlier carbines have a raised "C" while late ones have a stamped "C".


he front sight is still "F" marked at this point:

Judging by the M4A1 Socom and 6920HBPW models, the "F" mark has now gone the way of the Dodo. Since fixed carry handles are far in the rearview mirror at this point, why would you need it, right?


Barrel marking:

This marking seems to now be gone too as the latest barrels have Colt's Cage Code instead of the "C" mark.


Typical A2 flash hider secured with a crush washer:



"M4" mark at the front of the upper receiver:



Standard "H" buffer:



The bolt is still "C" stamp marked:

This marking is now gone too. On the latest rifles, if it's present at all it's done by some sort of sloppy engraving method. Refer back to the US Property Marked M4A1 I posted and you'll se what I mean.


The "MPC" mark on the bolt:



Closeup of the markings on the right rear of the lower receiver:

The space age barcode doohickey is clearly engraved. "FIRE" and "SAFE" are clearly stamped. I can't say about the manufacturer's mark but I think it's stamped/roll marked.


Detail of the markings on the magazine well:

The serial number is engraved but the rest is still an old fashioned roll mark/stamping.


The barrel is dated April of 2016:



Upper handguard removed showing the heavy barrel:

You can clearly see the double lining in the "M4" handguard to help dissipate heat.


Both handguards removed showing just how thick the barrel is on the 6721:



I've not noticed this "W" mark before:

It's on top of the barrel at the rear and just in front of the barrel nut.


You ALWAYS have to be careful of what you read online. I've read again and again that ALL Colt M4 handguards should have the heat shields glued in place. Clearly, that is inaccurate as can be seen in the pictures below:



After removing the inner heat shield, you come to the outer heat shield:

All you need to do to remove the heat shields is to GENTLY squeeze them to remove them from their retaining slots. DO NOT gorilla squeeze them or you will bend them.


Better yet, pay attention to what is stamped on them and DO NOT REMOVE:



Just so you don't have to, I've done it for you. If you remove both heat shields, here's what you'll see:

Pretty boring stuff. Just leave your heat shields alone and enjoy them as is.


This one is marked "CAV 5", which tells us it came rom cavity 5 of the mold:



A detail of the texture on a late model Cot M4 handguard:

I post this because handguards are often switched out. Colt handguards, while not actually made by Colt, are specific to Colt. There are certain details that you will only see on Colt supplied hand guards. I advise you to do some research and you'll learn what to look for. Again, experience is the best way to tell what you are looking at.


In the next post, we'll look at a 6920HBW. Why Colt made it, I don't know. What I DO know is Colt didn't make very many and they are pretty interesting. Check back for some pictures of that one. I think it's neat. But then, I think they are ALL neat. See you in a bit!
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