Give the lower a good cleaning. Inspect the hammer, trigger, disconnector and associated springs for damage and ware.
One of my high round count 15-22s (over 100k) started having occasional issues like you described. Found the disconnector was worn. Replaced it with a new disconnect and spring and issues when away.
Last edited by cjt50; 05-04-2020 at 12:18 PM.
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