Marlin made several changes to the 39A in 1975 I believe. Post '75 parts seem easy to find while the earlier models are not. I have a '56 and once lost the firing pin at the range but didn't realize it until I got home. Started scouring the Internet that evening for replacements and found nothing.
Luckily found it on the ground at the range the next morning.
Luckily found it on the ground at the range the next morning.
