I recently obtained a 39A, rear sight was not complete, but
I wedged a cedar shim underneath it, took a few shots into a dirt pile to reveal where I was hitting, got it sighted in and was hitting man size targets at 100yds off hand,I was very happy with accuracy and cycle-ability
I learned today that in the early 60's, Marlin changed the rear sight completely. Mine was made in 1960 and is the old style, the one I got to replace it was made in 1966 and doesn't fit. Back to the cedar shim until I find the right one, but she is a joy to shoot and will be a fantastic present to my 7 week old daughter in a few years.
Last edited by JonS; 11/23/10. Reason: total change of post