Quote:
Originally Posted by copperdozer1
thanks for the help with 39a.Further investigation was th serial # was w 778.Also went range to sight in and fire.WOW BIG PROBLEMS HAMMER WOULD NOT STAY COCKED SOMETIMES FIRED WHEN HAMMER DIDNT LOCK.Need some help on this one,Thought hammer might be worn. 
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Ok, first, download the manual, if you haven't already.
Marlin has it, as well as Steve's Pages 7b.
http://stevespages.com/pdf/marlin_39a39m.pdf
Next, with manual open, take it apart per the instructions.
Doing otherwise can cause issues for your rifle...
Clean everything and inspect the action. Take a few pics of the guts as you take 'em apart
and post 'em, we'll look and see if we see anything funky.
Re-assemble per the instructions...doing otherwise can cause Issues...
Hopefully, someone just put the leaf spring in wrong...or it's totaly worn out.
Or the hammer might be misaligned/worn out.
Ya never know till ya get it apart...
Fortunately, they're pretty easy to figure out once you've got 'em apart.