I own one of these 22 marlin lever aciton rifles. very good gun.
there was a site to download gun manuals, but at the time I know there was conflicts and disputes on it being leagal. the site is not working now , so it might of been shut down.
www.stevespages.com/page7b.htm
but it was nice to have to get a manual quick if you needed one.
call marlin fire arms , I am sure you could get a break down manual from them.
there is not too much to this gun. its pretty simple to figure out.
I had a few problems with it ejecting some ammo, but if I buy the more expensive amo it seems to have no problems.
remmington bulk 22 ammo seems to work ok most of the time. but it still jams a little.
I called marlin fire arms, and told them that I needed a new ejector and the other little part that grabs the shell to pull it back . they sent me all the parts free of charge. but this gun is still under warrenty.
get the manual and check it out. the break down of the gun should be very simple. just follow the instuctions. look at the fireing pin. if it looks defective. call marlin fire arms. I am sure it is not too expensive. and it will be worth it to get it fixed.
I love my marlin lever action 22. its easy to disasemble to clean and fix.