More AR180B Prototype Parts Found in the Wild

I picked up what was sold as an AR180 trunion but I could tell from the pictures that it wasn’t exactly that.

AR180 trunions are not flat on the side. They are forged into a rough shape that leaves the sides with a relief.

Photo courtesy of

This newly discovered trunion is built like the ones used in the AR180B.

What made the AR180B trunion unique was the fact that they turned down a regular AR15 barrel extension and pressed it into the trunion shown above. This was obviously a cost savings measure.

What is so cool about the newly found trunion is it proves that they didn’t start off with that in mind. They were going to make them one piece.

The final piece of evidence that shows this was not built for the AR180 but instead the AR180B is that it will not head space with an original barrel but will with an AR180B barrel.

It’s too bad that this wasn’t used in the regular production AR180B. It certainly would be more durable when barrels needed to be swapped out.

Surplus AR180B Parts at

Just a quick heads up that I’ve got some surplus 180B parts in stock and ready to go.

Biggest and hardest to find parts are complete bolt carrier groups. I’ve been able to put together a few of these and I don’t know if I’ll ever be able to source all these parts again. By the way these can be machined to work in an original AR180 if needed. I don’t provide the service but any competent machinist or gunsmith can help you out.

Another item that has been asked about a lot are original extended length hammer and trigger pins. These are new old stock Armalite production, as are all these parts.

Take a look around and see if there is anything you might need to finish a build or to have spares.

Heading to SAR West

I’m getting a couple table and setting up in the SAR building this year. I’ll be there Friday, Saturday, and Sunday.

I’ll have lots of stuff to show and to sell so come find me if you happen to be there this year.

I’m Reposting Content to Twitter/

I just wanted to give everyone a heads up that I am reposting my original blog posts over to Twitter/

I’ve been having some issues with other social media platforms shadow banning me so I’m doing this to hopefully build my audience over there.

First post is live.

Jump over there for a trip down memory lane or see my older content for the first time.

Please follow, like and share my stuff over there. I can’t do this without your support.

Thanks again.



Updated Product and a Sale at

Just a quick note to my subscribers.

Updated charging handles for the BRN-180 series of uppers are now in stock and shipping.

They have been made slightly longer to ensure no clearance issues with the dust cover as well as the addition of an o-ring to limit unwanted rattling.

There is also a sale going on for the rest of the month of July. Cone flash hiders are $10 off. No coupon needed.

Thanks for supporting the site with your purchases. It keeps this information available for all the fans of the AR180 platforms.