Hey there! Chris from Armageddon Tactical here. I have been sort of watching this thread for a bit and wanted to comment.
Armageddon's crush washers were developed with 2 things in mind: eliminating excessive barrel thread torque when timing muzzle devices and reducing installation time and frustration. I have experienced both with conventional products. Colt Industries recommended 15-20 lb ft of torque so I set out to achieve that. This was done through a combination of materials and design. I also wanted them to provide a full turn after engagement so that is why the internal groove is 1mm wide. The lead on a 1/2-28 thread is 0.0357" and the groove is 0.039" wide. I am sure you can see the correlation. The outside profile is functional as well. The angle you see on the face allows the washer to "ultimately crush flat" while the ID angle keeps it from clamping down on the threads after collapsing. No just pretty but functional. They are also more expensive to produce than conventional crush washers so I am not capitalizing on pretty - just trying to cover costs as any business would.
I know this product is not for everyone. No product is. However, if you have concerns about the stress placed on your barrel and the time and effort you spend installing a muzzle device it is worth considering. Can't ask for anything more than that.
Also, it is a R&R (remove and replace) item as are all crush washers.
Best,
Chris