Ah... reading blurry, pixelated numbers.
It's like trying to identify ink blots.
I like the concept of it being 12-07-2011 (slashes through 0's, bottom of Y being blurred out and lost on zoom in.) It might be a harmless and self-imposed let down, but it beats waiting without a date to look forward to at all!
But no, you know what I think? I think we need a second opinion:
http://www.planetside-universe.com/m...ts/tpblog2.jpg
A.D.(wth? I.D. maybe?) 1257-2211 is what I get from there, and I have no reason to believe the numbers randomize from weapon to weapon, or from side to side even. Could also be A.D./I.D. 1253-2211. But comparing the two images, the only real difference from either side is that the numbers are on a sort of plate/sticker in the linked image, where as the OP's image they are not. Also, the OP's image the lettering is U.I.