Welcome to the forums from the Wiregrass! It is possible the single action notch is clogged with soot/dirt so the sear cannot engage. Remove the grips and soak the gun in a 50-50 mixture of auto transmission fluid and acetone in a sealed container for a few days to a week. Then, blow out the action with aerosol carb/brake/parts cleaner until the effluent runs clear. If that doesn't fix it, it may need for you to go into the action to clean it or to find out if the notch is damaged.
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Guy
SWHF #474 SWCA LM#2629
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