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I understand the function of the lock bushing, but does the chamber bushing function in a similar fashion? Why two versions?

Any word on the release date of these two?

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The brass bushing cuts down on chamber adapter movement by making it fit better in the barrel extension.  It cuts down on up,down, left and right wiggle, but doesn't do anything for in and out movement. The 2nd version cuts down on shifting in all directions.  Not sure on the exact release, I am finishing a run of chamber adapters that are set up for the bushing.  These will some with the standard brass bushing only. The locking version will likely be around October.