Thanks for the quick replies, Pete and Tim.
Pete, I am going to show my ignorance here, but I can't locate the underlug. I'm not sure what it is. I broke open the rifle and looked everywhere I could, but found no numbers etched in it. Would this require me to take the rifle apart?
The rifle's serial # begins with NS, so I agree with Tim in that I should be good to go if I want to take advantage of the accessory barrells. Also, the stock has a gold emblem embedded in it. The emblem says "Limited Edition NEF New England Firearms". Does anyone recognize this?
Thanks again for the responses. I really enjoyed finding this site. It is good to find a place where there is so much information about these rifles.
Jimmy