Under the muzzle on the frame there should be a two letter code. A is 0, B is 1, C is 2, etc. No I's so skip those. So a gun with code of AA was made in 2000, AB in 2001 and so forth...
A B C D E F G H J K
1 2 3 4 5 6 7 8 9 0
i THINK THAT'S RIGHT ANYWAYS,....