Comments on: AR-180B trunnion design

By: Charles Moeller

Charles Moeller — Wed, 30 Nov 2016 22:15:31 +0000

When I tried to remover my barrel the barrel extension turned instead of the barrel unscrewing. What should I do now?

By: Kerwin Kerr

Kerwin Kerr — Sat, 01 Oct 2016 21:43:51 +0000

I would also advise putting a 1913 Picatinny rail on top of the receiver. If it’s aluminum you can you can rivet it to the top of the receiver. If its steel then I’d have it either spot welded or heliarc welded to the receiver. Using the old style AR180/18 scope mount rail is not a good idea.

By: Rufus

Rufus — Sat, 01 Oct 2016 15:29:43 +0000

Are there any dimensioned drawings for this 2 peice trunnion ?

By: Dan E

Dan E — Fri, 31 Jul 2015 21:56:21 +0000

thanks for this, is very informative

By: Pete F.

Pete F. — Fri, 31 Jul 2015 02:03:24 +0000

Interesting research on the barrel extensions. I have those parts but never looked at them in so much detail.
Pete

By: Kerwin Kerr

Kerwin Kerr — Thu, 30 Jul 2015 20:18:51 +0000

Correction! On my last sentence I meant magazine release!

By: Kerwin Kerr

Kerwin Kerr — Thu, 30 Jul 2015 20:17:01 +0000

This is a good idea if it reduces production cost. Has anyone given any thought to my engineering change of converting the new prototype to take a STANAG magazine? One of the main reasons why the AR-180 was a failure was because it didn’t use STANAG magazines. The original magazine was actually a well thought out construction, it was just put on the wrong side of the gun!

By: Rick Kelley

Rick Kelley — Thu, 30 Jul 2015 14:39:11 +0000

I just re-read the article and I misstook the flat bottomed trunion for a flat bottomed extension.

By: Rick Kelley

Rick Kelley — Thu, 30 Jul 2015 14:36:20 +0000

I knew that they must have turned down the diameter but the flat on the bottom is a revelation.

That solves two problems at once, room for the locating boss and it keeps the extension from rotating.

Thanks for all your hard work.