Screw silencer on and mark where it comes to on the barrel without the bush. Take it off and measure the diameter of the barrel at that point where you'd expect the bush to sit. Approx 10mm further than the silencer( measure how far it comes out of the silencer when in place)Take the bush to anyone with a lathe and turn it out too be at least 2 thou larger than that measurement. You can run even without it. But risk foliage etc getting down the gap. Bush should just have a small clearance. Even a drill press with a close size drill bit would work to enlarge it. They are designed/ expected to be turned to suit the individual barrel when bought so made with a relatively small hole to start with.
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