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Installing one of those bushing in a Knight Breech Plug may be the best way to go. It may be easier to remove the brazed vent liner if one were going to install the bushing and not a vent liner. The 0.030" bushing would work good. One can't use rifle primers in the Knight plugs, so using the bushing would be an excellent solution to vent liners that wear out using shotgun primers. Wonder what the thread of the locking collar is? Perhaps 5/16-24.. 3/8-24..