perhaps this can help you Is there a list of serial numbers and manufacture date?
Mitch in MI posted December 12, 2003 10:33 PM
Look at the 2nd letter of the serial number.
(I'm pretty sure 1995 is J, 1994 H, etc)
K=1996
L=1997
M=1998
N=1999
P=2000
R=2001
S=2002
T=2003
You're looking for N or later if you want to be able to order the barrels marked with an asterisk on the accessory barrel page.