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I took an aluminum cleaning rod and bent at a 90 deg angle to use the pistol brush with. Loosening the gas block screws and tightening back with equal torque usually gives some gain in accuracy. It may shift the point of impact on the target also.
I have even taken the gas block halves off and sand the surfaces true with emery cloth and wood dowel. You want the best fit to prevent leaks, a lot of minis are sold without the gas block close to having even torqued screws. The halves will be gapped big on one side and almost touching on the other. ;)
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