New AR-180 Uppers?

It looks like Chuck over at the GunLab has got his paws on an “In-The-White” AR-180 upper and if you know him like I do, that means we might be seeing some new uppers available soon.

I called him and we chatted for quite a while. He is hoping to make a run of these and offer them complete with trunion welded in but nothing on top. No dovetail, no rear sight. Perfect for those who want to build your own AR-180C flat top clone. He also is planning to make a run of flats.

I look forward to the day when the hobbyist like me, and many of you, can build our own AR-180 from scratch. That day may be closer than you think.

180B Upper-2

180B Upper

Reader Letter: New Bolt Hold Open for Original AR-180’s

Reader Eric just sent me a message via the contact page and I have to say, it is something I have never considered before. I think it is a great idea. Here is the message he sent me;

From: Eric XXXX
Subject: Can we do a poll?

Message Body:
Hey guys, I was wondering if it was possible to put a poll up on the blog? Reason being, I’ve been communicating with Chuck at Gun Lab about making a bolt catch for original AR18/180’s modified to use mags with standard STANAG followers. I believe this will be a great opportunity for him plus provide us Armalite owners with a much-needed and way-overdue mod for our rifles. Simply put, no more “STANAG or Armalite” mags, just put a slit in a standard STANAG, PMAG or any of the dozens of other mags and it’ll function in the Armalite AND M16/M4/STANAG platform with a simple slit cut in the right-side mag body.
The poll would be simple…
“YES, I would buy this and maybe prepay”
“Yes, I like the idea but want to wait to see how it turns out (price, availability, quality)”
“No, I like being limited to overpriced, rare mags or modifying others to where they can’t be used in any other rifle”
Chuck might be on to one of the best mods to happen to the AR18/180 since it went to market. If we can put up a poll so he can see the interest, I’m sure he’ll move this up his “to do” list.
Thanks and thanks for the site and reviving the AR18/180 legacy!
~Eric, proud owner of a 1982 “widow-maker”


Please comment and let me know what you think of the idea.

Full Auto AR-180 Conversion on Gunbroker

I was alerted to this interesting full auto AR-180 conversion by a reader and I contacted the seller to get more information. I had assumed that all conversions used the same system as the AR-18 but my research shows that there are many different ways to get the job done.


This particular gun also brings to light the crazy gun laws that we have to deal with and in particular those surrounding full auto guns in Connecticut.

First lets see how an AR-18 worked.


You can see in this picture that the upper receiver has two tabs that retain the auto sear. A link is attached to the sear that rides along the bottom of the upper and is tripped by the bolt carrier. The sear acts upon the rear of the hammer. The hammer is different than the one used on an AR-180 as is the disconnector, bolt carrier, and firing pin.

This conversion goes about it in a completely different way.








This conversion is on a Howa AR-180 and it has a sear that acts on the front of the hammer. It appears to have a pivot added to the front of the fire control box and you can just make out the pin location in the picture above. The sear has a tail that is tripped by a piece that was welded on to the bolt carrier. It uses all the original 180 fire control parts with the exception of the disconnector and the safety. The 180 firing pin is also retained.

I wonder if this is how the Widowmaker conversions were done?

Now for the Connecticut twist on this story. It appears that those who drafted their assault weapons ban tried to get machine guns classified as assault weapons and in doing so, left the door open for guns that are full auto only. You can’t own a registered select fire weapon (one that fires Safe/Semi/Full) but you can have a papaered Full auto machine gun (Safe/Full). This gun is one such animal. For those that live in other states, it can be converted back to a select fire configuration.

Please feel free to comment about any conversions you have come across. I think this is a very cool part of the history of the AR-180.

Armalite AR-180 Serial and Production Numbers

I feel a bit remis that I have not covered some of the more basic information for collectors on the Armalite AR-180 serial and production numbers.

I have been trying to verify this information through other sources but so far I have come up empty handed, so here is what I have been able to find.

Production began in July 1969 in Costa Mesa CA and continued till 1972. Howa production was from 1970-1974. Sterling production was from 1979-1985.
Costa Mesa rifles
S0001-S0012 July 1969 12 rifles
S0014-S0050 no date 37 rifles
S0030 no date 1 rifle
S0077 no date 1 rifle
S0101-S4067 no date 3967 rifle
TOTAL 4018 rifles

Howa rifles
X000001-X000012 Oct 1970 12 rifles
S000001-S001000 no date 1000 rifles
S10001-S12915 Feb 1974 2915 rifles
TOTAL 3927 rifles

Sterling rifles
S15001-S27363 1979-1985 12,362 rifles

The first 1000 Howa rifles had the serial number on the upper and the flash hiders have matching serial numbers on them.

Total production was 20,307 not all of which were imported to the US. Some were also exported to Ireland and there has been some attrition as well. I estimate something like 15,000 to 17,000 left in the US.

Quite rare when you compare them to even Colt SP1 numbers which approach 225,000 not to mention the number of M16’s made. Builds an AR-180B Bolt Hold Open

Chuck over at is making great progress on the AR-180B lower parts and he just put up an article outlining his procedures for building the bolt hold open.


If you are not following him, you should. His sight is a wealth of knowledge and he is always willing to share it with all of his reader.

Once again, we hope to be bringing these parts kits to you as soon as we can. Let me know if you are interested and I will put your name on the list.