Ty:

I have the Springfield 67D. The barrel on mine does not come out, but it is a late 50's model....as far as I know that design feature did not change on the later models like yours, so I'd be surprised if you can replace the barrel. From what I've been able to find the model series "letter" has no correlation to date of manufacture. I don't think Savage started serial numbering their guns until '68. I've never come across a serial# listing, but there's a guy over on the shotgunworld forum that can ballpark the date for you from his own accumulation of data. The fixed choke on it will be based on the barrel length....30"=full, 28"=mod, 26"=IC.

Jeff