Check the sear bar's plunger to see if its motion is gummed up by accumulated stuff in its well. Fiddling with the mag may jiggle it loose or give it some time so that it pops back out and works thereafter.
To be completely removed, the retaining pin for the plunger must be pressed out, which is a pain. Running solvent and lube into the system and working the plunger in and out repeatedly to flush out gunk usually works. Compressed air or "blaster" shot in there will also help.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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