I felt like such a dork when grunting and sweating to get the thread protector off. Then it easily spun off the "wrong" way! I'm glad to hear I wasn't the only one.
That is interesting info about the oring diameter. I think I will try two since the first one will be more in compression. It is hard to believe that AI are making an Ali magnum can for government users! This is the group I am trying to build for and I can guarantee 5k rounds from the can with the brake in place to take the hit from the initial blast. Pressure from the magnum is not a problem as I can both thicken the material in the blast chamber as well as add stiffeners.
You can just see the stiffeners in the left side of the view looking into the can. ON second thought, there is no evidence of gas escaping the current oring. I might try another method to eliminate what might be the blast hitting the sides of the can since they did vent pretty forcefully and might be causing "hammering" noise going aft rather than gas venting.
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