Is there any way to tell the difference by looking at an SB1, or SB2 reciever? I saw a NEF .410 shotgun at a local shop. The reciever was the "patterned" finish like the Buffalo Classics. The serial number was NL 200157, which is a 1997 model if I'm not mistaken. The barrel was stamped .410 Pardner. My guess is this is a SB1 reciever and has the same barrel that came out on it. How can I tell the difference between the SB1 and SB2 for sure?