
Originally Posted by
robinghewitt
If it's ancient I'd look for wear on the sear.
If it's modern I'd look at the trigger return spring.
Pull the hammer back and watch the trigger, you should see it dropping in to the two sear notches. If not the spring has gone.
Hold the hammer back then push the trigger forwards. If it moves to latch then either the spring is nadged or there is something getting in the way.
If it drops into a rounded out full cock sear then gets pushed out when you let the hammer down you should see the trigger move backwards.
Robin