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I considered that, but none of the pistols I'm interested in suppressing have 1/2x36 threads.
I'm not sure what you mean by filling the birdcage up with crud. As I understand it, the birdcage is removed entirely, and the silencer is installed in its place with the fixed mount.
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I meant you put a 1/2-36 to 1/2-28 adapter on the PSA 9mm barrel…so that firearm and all your pistols have 1/2-28 threads.
I don’t have an Obsidian, but based on the cans I do have and the pics of the Obsidians I’ve seen, I believe it’ll have the same issue my Octanes have. You’re moving the piece in the bottom right of this pic…the black adapter piece, the piston, and the spring:
…and replacing it with the fixed mount, which is similar to the black adapter except it’s threaded 1/2-36 on the inside. If you look inside your silencer, the place where the teeth of that piston will engage is the area I’m talking about.