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IAR 11.5 Uppers available (Page 7 of 11)

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12/13/2025 7:20:17 PM EDT
[Last Edit: TallPine][Edited] [#1]
Any chance AU or Colt will swap barrels? IIRC its a std 6940 barrel.  They should have plenty with lugs. Use these for the fudd states.
12/13/2025 7:51:29 PM EDT
[Last Edit: LIL-COMMANDO][Edited] [#2]
I am keeping mine even though it does not have the bayonet lug.  This was designed as an IAR so does the M249 have a bayonet lug?
12/13/2025 7:51:47 PM EDT
[#3]
Can't stand the look of the 16" especially with a can

11.5" is where it's at





2nd Battalion 9th Marines Echo Company

3rd Battalion 8th Marines India Company
12/13/2025 8:37:25 PM EDT
[Last Edit: Milspec99][Edited] [#4]
Quote History
Originally Posted By lt1_sport:
Mine came with an unmarked carrier and extractor.  The bolt is just marked mp, colt to cheap nowadays to even run the gold extractor spring…luckily I keep spares.

https://imgur.com/a/DL63kDk

View Quote


That's weird.  No gold extractor spring and a donut.   I believe my M5 came with the gold spring and no donut.  I'll double check.  I need to pull it out this weekend to finish the work on it that Colt did not complete.
12/13/2025 9:32:20 PM EDT
[Last Edit: Twizm][Edited] [#5]
Mine came in today! Looks good, has the faint blue tone finish. Cage coded CH and MPC marked bolt. Yeah, sucks it doesn't have the bayonet lug but I'd probably never use it. Might order an RRH bayonet kit just to have, should I feel the need. All in all I am happy..

12/13/2025 10:07:23 PM EDT
[#6]
Quote History
Originally Posted By Twizm:
Mine came in today! Looks good, has the faint blue tone finish. Cage coded CH and MPC marked bolt. Yeah, sucks it doesn't have the bayonet lug but I'd probably never use it. Might order an RRH bayonet kit just to have, should I feel the need. All in all I am happy..

https://imgur.com/a/qjeSqly
View Quote



Attached File
Free men do not ask for permission.
12/13/2025 10:16:48 PM EDT
[Last Edit: KitBuilder][Edited] [#7]
Quote History
Originally Posted By LIL-COMMANDO:
I am keeping mine even though it does not have the bayonet lug.  This was designed as an IAR so does the M249 have a bayonet lug?
View Quote View All Quotes
View All Quotes
Quote History
Originally Posted By LIL-COMMANDO:
I am keeping mine even though it does not have the bayonet lug.  This was designed as an IAR so does the M249 have a bayonet lug?
The M249 was designed as an LMG with quick-change barrels while the IAR is an automatic rifle, but one of the requirements of the IAR contract was a bayonet lug.

I don’t expect my M249S to have a bayonet lug, since it isn’t on the contract production weapons, but on 16” Colt IARs it is supposed to be there. I’d have no problem with it being optional from AU, but they didn’t give anyone the option. They didn’t even say that it wouldn’t be there.

Originally Posted By Twizm:
Yeah, sucks it doesn't have the bayonet lug but I'd probably never use it. Might order an RRH bayonet kit just to have, should I feel the need. All in all I am happy..
The RRH lug says it only fits barrel journals with diameters between .738″ to .745″

I’m thinking the journal on the Colt barrel is .750” at that location. Not sure though.
We really shouldn’t have to add our own lug. Not an easy thing to do.
12/13/2025 10:37:32 PM EDT
[#8]
Quote History
Originally Posted By KitBuilder:
The M249 was designed as an LMG with quick-change barrels while the IAR is an automatic rifle, but one of the requirements of the IAR contract was a bayonet lug.

I don’t expect my M249S to have a bayonet lug, since it isn’t on the contract production weapons, but on 16” Colt IARs it is supposed to be there. I’d have no problem with it being optional from AU, but they didn’t give anyone the option. They didn’t even say that it wouldn’t be there.

The RRH lug says it only fits barrel journals with diameters between .738″ to .745″

I’m thinking the journal on the Colt barrel is .750” at that location. Not sure though.
We really shouldn’t have to add our own lug. Not an easy thing to do.
View Quote



I measured mine at .745. Hopefully I can make it work. Agreed we shouldn't have to do it ourselves, but such is life. I'll confirm fitment when it arrives.
12/14/2025 12:24:15 AM EDT
[#9]
Quote History
Originally Posted By Twizm:



I measured mine at .745. Hopefully I can make it work. Agreed we shouldn't have to do it ourselves, but such is life. I'll confirm fitment when it arrives.
View Quote

Please do share your findings when you have a chance to test it all out.  I'm not sure the lack of a bayo lug is a deal breaker for me but being able to shoehorn one back on is definitely a plus!
Support the Firearms Policy Coalition and help save the Second Amendment: https://www.firearmspolicy.org

The opinions expressed here are my own and do not necessarily reflect the views of my current or former employers.
12/15/2025 11:33:38 AM EDT
[#10]
Check the tightness of those rear sights folks.
12/15/2025 3:15:12 PM EDT
[Last Edit: Findsman][Edited] [#11]
UPS came early today!

Nothing unsurprising based on what everyone has said.  Doesn't seem to have any weird hues to the ano but I haven't tried to take a pic yet.  No bayonet lug but I am definitely unbothered.  Matech BUIS, locking front flip sight.  Mine had a C-marked carrier and MPC-marked bolt, charging handle looked unmarked.  Definitely a big boy with that heat sink.  Used a PSA M4A1 lower and it looks pretty good together.

Financially horrific timing but it's something I'm happy to add to the collection.

ETA - quickly took a pic.  Not sure I like the PA 5x and Matech together since the optic is pushed forward so far, just what I had on my desk.  The eyebox is so tiny on the PA that I've had trouble finding a home for it anywhere.

Attached File
Support the Firearms Policy Coalition and help save the Second Amendment: https://www.firearmspolicy.org

The opinions expressed here are my own and do not necessarily reflect the views of my current or former employers.
12/15/2025 11:25:04 PM EDT
[Last Edit: Apple3_14159][Edited] [#12]
Colt's 2024 catalog shows IARs both with and without the bayonet lug.

12/16/2025 12:18:10 AM EDT
[#13]
Quote History
Originally Posted By Apple3_14159:
Colt's 2024 catalog shows IARs both with and without the bayonet lug.
View Quote
Interesting.
Thanks.

https://www.colt.com/wp-content/uploads/2024/08/2024-Colt-MLE-Catalogweb.pdf
12/16/2025 9:51:22 AM EDT
[Last Edit: SkkDV][Edited] [#14]
Good looking upper
12/16/2025 3:58:31 PM EDT
[#15]
What bipod is that?
12/16/2025 5:01:22 PM EDT
[Last Edit: Twizm][Edited] [#16]
Quote History
Originally Posted By friendswoodeod:
What bipod is that?
View Quote


That looks like an Atlas. Possibly a BT10-LW17 V8 Atlas..
12/16/2025 6:02:59 PM EDT
[#17]
^^^Thanks
12/17/2025 10:41:50 AM EDT
[#18]
My 16" IAR upper half arrived yesterday.  As detailed in previous posts, it didn't include a bayo lug.  However, it did include a bolt carrier group and charging handle in the upper half and a separate bolt carrier group and charging handle in a zip lock bag.  I wonder if that's them trying to make up for the lack of a bayo lug, a failure to pay attention, or a bonus to me for being such a wonderful customer.
12/17/2025 10:51:07 AM EDT
[#19]
Quote History
Originally Posted By Bret:
My 16" IAR upper half arrived yesterday.  As detailed in previous posts, it didn't include a bayo lug.  However, it did include a bolt carrier group and charging handle in the upper half and a separate bolt carrier group and charging handle in a zip lock bag.  I wonder if that's them trying to make up for the lack of a bayo lug, a failure to pay attention, or a bonus to me for being such a wonderful customer.
View Quote


No, my guess is they slipped in an extra set of bcg and ch not realizing they were already installed. Most uppers seem to be arriving with upper in sealed Colt bag and bcg/ch in separate bag. They obviously popped your bag open and installed bcg/ch, then mistakenly added another set of bcg/ch in separate bag like all others. Thats a nice $200+ bonus for you.
12/17/2025 11:16:54 AM EDT
[#20]
Quote History
Originally Posted By TallPine:


No, my guess is they slipped in an extra set of bcg and ch not realizing they were already installed. Most uppers seem to be arriving with upper in sealed Colt bag and bcg/ch in separate bag. They obviously popped your bag open and installed bcg/ch, then mistakenly added another set of bcg/ch in separate bag like all others. Thats a nice $200+ bonus for you.
View Quote


Bonus!
12/17/2025 12:37:28 PM EDT
[#21]
I'm torn about what to do.  Normally, I'd just email them letting them know about their mistake and ask for a call tag to ship the extra parts back.  However, I didn't get the bayo lug that was advertised.
12/17/2025 12:50:59 PM EDT
[Last Edit: TallPine][Edited] [#22]
I would do what you think best. Everyone has different comfort levels. They will probably tell you to just keep it as they shouldn't offer it to anyone else after leaving their hands...they wouldn't know if you monkeyd with the bcg, swapped small parts, etc. Kinda like extra groceries in your bag...you can return it but the grocery store tells you to keep it, they can't put it back in inventory.
12/17/2025 5:18:25 PM EDT
[#23]
Quote History
Originally Posted By Bret:
My 16" IAR upper half arrived yesterday.  As detailed in previous posts, it didn't include a bayo lug.  However, it did include a bolt carrier group and charging handle in the upper half and a separate bolt carrier group and charging handle in a zip lock bag.  I wonder if that's them trying to make up for the lack of a bayo lug, a failure to pay attention, or a bonus to me for being such a wonderful customer.
View Quote

12/17/2025 8:13:46 PM EDT
[#24]
I just removed the MATECH only to fit the magnifier with an A.R.M.S. rear sight. The undersight of the sight is even marked with Colt's CAGE!

https://imgur.com/a/MrjXAiN
12/17/2025 9:24:07 PM EDT
[#25]
Attached File
Free men do not ask for permission.
12/17/2025 9:46:50 PM EDT
[#26]
Very nice. My Socom model came thay way as well. Luck of the draw on these markings I think..
12/18/2025 3:07:26 AM EDT
[#27]
Quote History
Originally Posted By Bret:
I'm torn about what to do.  Normally, I'd just email them letting them know about their mistake and ask for a call tag to ship the extra parts back.  However, I didn't get the bayo lug that was advertised.
View Quote


Do the right thing, easy.
12/18/2025 9:28:02 AM EDT
[#28]
Quote History
Originally Posted By Assh:
Do the right thing, easy.
View Quote

I emailed them to let them know about both mistakes, the lack of a bayo lug and the extra BCG & charging handle.  I'll let y'all know if they reply.
12/18/2025 2:42:53 PM EDT
[#29]
Quote History
Originally Posted By Bret:

I emailed them to let them know about both mistakes, the lack of a bayo lug and the extra BCG & charging handle.  I'll let y'all know if they reply.
View Quote


Good man, the ball is in their court.
12/20/2025 2:34:40 PM EDT
[#30]
ive been sort of tracking this colt iar story since the first spare uppers hit the market at the knob creek machinegun shoot thru kurt at ordanance research back in the day. the no bayo lugs are likely correct for the mexican contract over runs which is where the 11.5'' uppers originated it seems. theres a rumor the 11.5'' iar were fbi hrt but that may be just a rumor, time will tell.

this morning i was watching the colt ar15 resource channel on youtube and he mentioned and it reminded me that i should go grab a colt iar spare gas tube and barrel nut wrench at au while they are still available. i was totally shocked when i saw the colt iar uppers 16'' priced at 1399. each and verified the price was recent by noticing the happy feed backs everyone left on dec 17th just 3 days ago.

i then did a search for colt iar parts and was shocked again that the 11.5'' iar uppers were not only in stock at 1399. each but that they had 53 in stock as of today and they include the colt branded radian raptor charging handle and magpul metal rear sight and bcg. this is totally amazing because last i checked months ago iar uppers were 4300 on gunbroker and only one or 2 in stock nation wide.

amazing how prices change so quickly when colt releases there spare contract over runs. if anyone is on the fence jump now as ive seen these uppers rebound in price amazingly quick after they sell out. and yes they actually do retail and sell at the 4300 mark not just asking price but sold for past listings on the hated gunbroker when i searched months ago. verified.

the first uppers released onto us civilian market were the usmc trials uppers leftovers after the usmc failed to adopt due to some tricks the marines pulled in order to get their hands on the hk416 never wanting an iar colt to begin with is what ended up being the story.

the next over run to hit the us market was the colt iar singapore contract leftovers and then one or likely 2 now big batches of mexican contract leftovers which in my opinion may be what these are.

the mexican anti cartel police whatever they are called that ordered these have been pictured with the unusual 11.5'' variant in service already months ago and it would all make sense why no bayonet lugs. heavy hitter anti cartel police likely specified no bayonet lugs or else colt offered.

im not an actual colt iar nerd or anything im just noticing things by total accident remembering stuff. its something you guys might want to look into and verify from pics from the ongoing drug war in mexico. good chance the vast majority of colt iar in mexico have no bayonet lug if i had to guess.
independent fundamental baptist. NOT A COMMIE!
12/20/2025 3:04:13 PM EDT
[#31]
The recent 11.5" and 16" IAR upper receiver releases are new production. They are not associated with any domestic or international contracts.
12/22/2025 3:48:32 PM EDT
[#32]
Bad Attitude has an image of the IAR tribute lower on their site now

Low Key IAR Lower
12/22/2025 8:45:37 PM EDT
[#33]
You think the next batch will have the bayonet lug?
12/23/2025 4:53:54 PM EDT
[#34]
H3 has nothing to do with the heavy barrel, it has to do with the length of the barrel.
12/23/2025 5:19:31 PM EDT
[Last Edit: rust707][Edited] [#35]
That's why I'll never buy anything too expensive from AU just in case that if I get screwed it wouldn't be a huge loss. I know it sucks that customers are not always right anymore.
12/23/2025 5:25:03 PM EDT
[#36]
How did you manage to get a 16" with the bayonet lug on it? All the 16" we bought from AU with the bayonet lug missing, we got ripped off.
12/23/2025 5:51:06 PM EDT
[#37]
Why are so many people upset about the bayonet lug missing?  Why trash AU?  These are real Colt IAR uppers manufactured and sold by Colt.
12/23/2025 7:35:14 PM EDT
[#38]
Quote History
Originally Posted By onealphay2k:
Why are so many people upset about the bayonet lug missing?  Why trash AU?  These are real Colt IAR uppers manufactured and sold by Colt.
View Quote


This.
12/24/2025 9:52:48 AM EDT
[Last Edit: friendswoodeod][Edited] [#39]
Got it all set up

https://imgur.com/a/UJnlE0l
12/24/2025 9:59:30 AM EDT
[#40]
Quote History
Originally Posted By Wubaru:


This.
View Quote View All Quotes
View All Quotes
Quote History
Originally Posted By Wubaru:
Originally Posted By onealphay2k:
Why are so many people upset about the bayonet lug missing?  Why trash AU?  These are real Colt IAR uppers manufactured and sold by Colt.


This.
No.
Au should image the item they are selling. Cheesey.
Glock Derangement Syndrome > Trump Derangement Syndrome.
Plastic Fantastic Fanatic.
I love my little pro gun Viking wife.
She has the world's bluest eyes.
12/24/2025 7:59:18 PM EDT
[#41]
Quote History
Originally Posted By friendswoodeod:
Got it all set up

https://imgur.com/a/UJnlE0l
View Quote

Looks good
Attached File
12/25/2025 12:37:10 PM EDT
[Last Edit: rust707][Edited] [#42]
Why are so many people upset about the bayonet lug missing?  Why trash AU?  These are real Colt IAR uppers manufactured and sold by Colt.
View Quote


because it makes it non- authentic, a real colt IAR has the bayonet lug. It makes it a "Bill Clinton crime bill" gun.
12/25/2025 12:42:16 PM EDT
[#43]
You think the next batch will have the bayonet lug?
View Quote


If they do, it will piss people off even more since AU refuse to take return, AU should issue a recall for false advertising.
12/25/2025 12:57:27 PM EDT
[#44]
Originally Posted By TallPine:


Good info, I missed that somehow. Any idea when those are due in? Thx


Estimation is between Jan - Mar 2026.
View Quote


Will they have the bayonet lugs on? I have not opened mine, if the next batch comes with the bayonet lug, can I do an exchange? This really sucks.
12/25/2025 1:14:05 PM EDT
[#45]
If you bought one of the new IAR upper receivers and receive it without a bayonet lug, please comment here.
I'm curious to see if it is an isolated occurrence or if it happened with all of them.
View Quote


It's not an isolated incident, mine doesn't have the bayonet lug as I thought it would have it. Mine still sealed in the bag, just let me know if you'll get us one that has it, so I'll send mine back.
12/25/2025 1:15:48 PM EDT
[#46]
Quote History
Originally Posted By rust707:


It's not an isolated incident, mine doesn't have the bayonet lug as I thought it would have it. Mine still sealed in the bag, just let me know if you'll get us one that has it, so I'll send mine back.
View Quote


I have nothing to do with AU or replacement. I was just curious.
12/25/2025 1:28:33 PM EDT
[#47]
I have the same copy of this 2024 Colt catalog, the guy in the picture probably was a model and never fired a gun before.  The older Colt catalogs from the 2010's showed the IAR had the bayonet lug. The Colt IAR upper should have come with a bayonet lug, period.
12/25/2025 1:35:30 PM EDT
[#48]
Originally Posted By rust707:



It's not an isolated incident, mine doesn't have the bayonet lug as I thought it would have it. Mine still sealed in the bag, just let me know if you'll get us one that has it, so I'll send mine back.


I have nothing to do with AU or replacement. I was just curious.
View Quote


You seem to know the in and out of AU, even when their inventory will arrive, so I thought you had some inside connections with AU.
12/25/2025 1:36:27 PM EDT
[Last Edit: TallPine][Edited] [#49]
Colt probably used up a bunch of their 6940 barrels without lugs instead of making new correct barrels with lugs. But why would they have a bunch of 6940 barrels without lugs, and where were those destined to go? Maybe ban state sales that never materialized?
12/25/2025 1:45:28 PM EDT
[Last Edit: rust707][Edited] [#50]
Colt probably used up a bunch of their 6940 barrels without lugs instead of making new correct barrels with lugs. But why would they have a bunch of 6940 barrels without lugs, and where were those destined to go? Maybe ban state sales that never materialized?
View Quote


Ban states don't just ban "bayonet lug", they ban a bunch of other stuff with it, so a barrel without the bayonet lug would not qualify it as a "ban state barrel". My guess is Colt workers are being lazy, pinning a bayonet lug on a barrel is not easy, so they try to get away with whatever they can, time is money if you know what I mean. Since they know when comes to non-contract gun parts, civilians don't have the return right, unless it's defective or have safety issues. AU is responsible for false advertising in my view.

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IAR 11.5 Uppers available (Page 7 of 11)