How to replace the 2 firing pin in 22 marlin model 80

SOURCE: Trigger adjustment on Marlin model 925

I have read a lot about the Marlin 925 trigger problems, and there are a few youtube videos that explain it step by step. It seems to change it to about 3 pounds. I hope this helps!
Here's a link to one of the videos:
http://www.youtube.com/watch?v=YciMN5bGPZo

SOURCE: How to determine the model and serial number of a marlin 22 rifle?

this is copied from a site, the web address is pasted below.

The serial number depending on the model of rifle, will be located either on the upper or lower stock tang, or side of the receiver.
http://www.gunvaluesboard.com/marlin-serial-numbers-dates-of-manufacture-1664.html

also if you find serial # you may find more info here.
http://oldguns.net/sn_php/marlinlookup.php

From 1962 thru 1968 Marlins rimfire rifles (other than the 39 series lever actions) used a two letter date code that was stamped on the barrel. This date code is different than the one already listed, as Marlin rimfire rifles (other than the model 39 series) did not have a serial numbers until required to by Law after 1968. The first letter of the date code represented the month of manufacture while the second letter indicated the year. This date code was usually stamped on the left side of the barrel just in front of the receiver.

Marlin Serial Numbers Dates Of Manufacture

gunvaluesboard.com

SOURCE: What year is my marlin model 60 22 rifle serial number 72205505

That is most likely a 1972, I bought mine in 1974 brand new. I still have the box, but I can't read it. The corrupt cops of PA took all my guns and now you have to defend this country without me. I was good enough to go to Vietnam, but not allowed to protect myself when 2 people try to run me down with ATVs, on my own property.