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AR15.COM
11/5/2025 1:29:24 PM EDT
[Last Edit: Minuteman1636][Edited]
I just got an email notification of a new video drop from Arms Unlimited.
I watched it and it is a pretty good video. Those of you not familiar with the performance of the IAR will get a new appreciation for it when you see the firing of it toward the end of the video.

You can see the video here:
Colt LMG and IAR Comparison Video


Attached File

11/5/2025 5:14:44 PM EDT
[#1]
I'm looking forward to getting one of these IAR upper halves.  I wonder if AU will offer IAR marked lower receivers.
11/5/2025 5:18:56 PM EDT
[#2]
Colt currently has no plans to produce IAR marked lowers. I have already asked. I was really hoping since we got Commando and SCW marked lowers. I'm not giving up hope though. I would be first in line to buy two....maybe three. Lol
11/5/2025 8:49:49 PM EDT
[#3]
I really just want Colt to produce IAR barrels, even if just in limited runs. It's tailor-made for an FRT but not having a ready source for replacement barrels makes me hesitant to shoot it how it's meant to be used.
11/6/2025 11:53:59 AM EDT
[#4]
The IAR is just so damn cool.  Can't wait for the 16" drop.
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Opinions are my own and not the views of my employers, organizations, or other associated people.
11/6/2025 12:18:14 PM EDT
[#5]
I have both uppers for my Colt M16a2 lower. The IAR would not run initially because of severe bolt bounce.  I ended up with a hydraulic buffer, A5 buffer tube, and tubbs spring. It now runs reliably. The LMG upper always ran flawlessly. Interestingly the buffer spring combo works great with all of my uppers, including 300blk subsonic and 5.7. It also slowed the rate down to the 600s.
11/6/2025 5:02:09 PM EDT
[#6]
drjaydvm, that's good information.  Thanks for sharing.
11/6/2025 7:20:30 PM EDT
[#7]
Thanks for posting!

Do you know if the IAR puts any more strain on the lower than normal? I know the lmg firing from open bolt has a slight differences on the strain
11/6/2025 7:43:04 PM EDT
[#8]
I have not heard of any additional wear on the lower receiver.
11/8/2025 11:41:45 AM EDT
[#9]
Quote History
Originally Posted By aeyoung:
Thanks for posting!

Do you know if the IAR puts any more strain on the lower than normal? I know the lmg firing from open bolt has a slight differences on the strain
View Quote


The LMG upper is closed bolt
11/8/2025 11:43:01 AM EDT
[Last Edit: Minuteman1636][Edited] [#10]
Quote History
Originally Posted By drjaydvm:


The LMG upper is closed bolt
View Quote


True LMGs fire from open bolt.
The IAR is closed bolt.
11/19/2025 12:36:37 PM EDT
[#11]
Good luck finding one of the open bolt uppers. The closed bolt LMG uppers can be found pretty easily
11/19/2025 6:36:21 PM EDT
[#12]
Originally Posted By drjaydvm:
Good luck finding one of the open bolt uppers. The closed bolt LMG uppers can be found pretty easily
View Quote


Any upper can fire open bolt. It’s the FCG and BCG that designate open bolt.

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