Through my journey here today I stumbled across someone who touched on a stamping on the left side of the barrel, near the chamber end, stamped "JM" in a little circle, this stands for John Marlin. Does this stamp have any signifigant meaning? Do newer models have this stamping? also mine has north haven conn. I understand that even though it may not be made there they can still use the old stamp. would this otherwise have any thing to do with quality?