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Site News Could You Have Stopped This? Vegas Shooting Analysis with Attorneys on Retainer
8/13/2017 7:33:03 PM EDT
An amazing piece of Colt and USMC M16/M4 carbine weapon history. A rare opportunity to own modern US military firearm development history. Fewer than 200 available to the public. I couldn't resist and got one.

https://www.aimsurplus.com/product.aspx?item=XCOLTIARURG

8/13/2017 8:17:22 PM EDT
[#1]
From a purely mechanical sense, how are these different from a normal monolithic upper?  Just the heavy barrel and lower rail section (and heat sink in the IAR)?
8/13/2017 8:21:12 PM EDT
[#2]
I think you pretty much got it hollowpoint.
8/13/2017 8:23:20 PM EDT
[#3]
Made hot.
https://www.aimsurplus.com/product.aspx?item=XCOLTIARURG
8/13/2017 8:24:58 PM EDT
[#4]
I would love to have one but I can't justify it right now.

My understanding is these should be used with an H3 buffer to prevent bolt bounce with the heavy profile barrel.
8/13/2017 8:54:00 PM EDT
[#5]
Quote History
Quoted:
I think you pretty much got it hollowpoint.
View Quote
Any more details on the barrel (or a picture of one not installed)?  Guessing 1/7" but what's the profile...medium contour?
8/16/2017 8:44:59 AM EDT
[#6]
IARs feature Colt heat sink design
8/17/2017 6:29:21 PM EDT
[#7]
Quoted:
An amazing piece of Colt and USMC M16/M4 carbine weapon history. A rare opportunity to own modern US military firearm development history. Fewer than 200 available to the public. I couldn't resist and got one.

https://www.aimsurplus.com/product.aspx?item=XCOLTIARURG

https://www.AR15.Com/media/mediaFiles/336740/XCOLTIARURG-279638.jpg
View Quote


Nice find
10/2/2017 10:57:38 PM EDT
[#8]
Where did you hear that about the H3 buffers?  I have been looking for evidence of this.  Source?
10/2/2017 11:36:31 PM EDT
[#9]
Quote History
Quoted:
Where did you hear that about the H3 buffers?  I have been looking for evidence of this.  Source?
View Quote
It's from Chris Bartocci. My understanding is he used to work for Colt.
10/3/2017 5:37:39 AM EDT
[#10]
Quote History
Quoted:
It's from Chris Bartocci. My understanding is he used to work for Colt.
View Quote
Jaqfrost is correct. They had to use the H3 buffer to slow the rate of fire.

There might be some discussion in here: Colt LE6940 Discussion    The LE6940 and IAR6940 are obviously based on the same weapon.

Use of the H3 buffer is mentioned by Chris Bartocci in his article for Small Arms Review also.  Small Arms Review Article
10/3/2017 10:31:36 PM EDT
[#11]
We have a legitimate complete factory Colt IAR rifle and it came with an H3 buffer.
10/5/2017 5:48:00 PM EDT
[#12]
I just got mine from U.S. armament corporation.   I absolutely love it
10/23/2017 12:34:26 AM EDT
[#13]
On the way - Can't wait

Going on my 614 lower

V
OUT
10/24/2017 12:23:42 AM EDT
[#14]
I love mine.
10/24/2017 5:33:14 PM EDT
[#15]
Quote History
Quoted:
From a purely mechanical sense, how are these different from a normal monolithic upper?  Just the heavy barrel and lower rail section (and heat sink in the IAR)?
View Quote
It's piston-driven, isn't it?
10/24/2017 5:34:13 PM EDT
[#16]
Quote History
Quoted:


It's piston-driven, isn't it?
View Quote
No, it is di.
10/27/2017 11:06:59 PM EDT
[#17]
Shit; dust cover doesn't close...

Waaayyy too complicated to fix....two tiny one way gas tube retaining pin sized pins...that hold in the dust cover pin...yes...FUC&!



I went with the B5 stock because my beard doesn't get stuck in it. The Magpul grip has an extra bolt and firing pin for full auto logistics if needed.

V
OUT
10/28/2017 2:33:16 AM EDT
[#18]
That looks mean
10/28/2017 4:37:24 AM EDT
[#19]
Quote History
Quoted:
Shit; dust cover doesn't close...

Waaayyy too complicated to fix....two tiny one way gas tube retaining pin sized pins...that hold in the dust cover pin...yes...FUC&!

https://www.AR15.Com/media/mediaFiles/1678/DSC00479-345951.jpg

V
OUT
View Quote
It is good to see another owner. That is three of us now that I know of. Alex, you and myself. I can't wait to get home and get my weapon assembled.
10/29/2017 7:00:38 PM EDT
[#20]
Very cool.

Looking forward to more pics
10/30/2017 2:07:41 PM EDT
[#21]
Just for clarification sake.  These came with the Colt flip up integrated fsb, not the Knight's one as stated on AIM?

Might have been worth the price of admission if it actually came with the KAC Folding FSGB, not that it isn't/wasn't  at a great price point already.

Very cool piece for sure!
10/30/2017 2:12:20 PM EDT
[#22]
The uppers being advertised as 'prototype' is erroneous and creates some confusion for some. The color and configuration of the upper receivers for sale are the same IAR 6940 configuration as sold to Mexico which more than likely makes the contract overruns.

Chris Bartocci did a great article on the IAR which stated the actual prototype uppers were all FDE.
10/30/2017 3:56:17 PM EDT
[#23]
When you get home you are going to shoot it and fall in love with it. Accurate and cool.
10/30/2017 3:57:37 PM EDT
[#24]
Yes I agree, I think they are Mexico overruns.
11/23/2017 2:16:39 AM EDT
[#25]
I'd been eyeing one of these as well since August to go along with my Colt LMG upper. Mr. Guns n Gear has one but IDK if he did a video review of it.

S/F

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