Beware of scammers.

I have a 40-x with a barrel code KQ and SN 063111 B. Barrel is light weight sporter rather than heavy target. Stock is HS Precision. Does that SN match the time range of the barrel? Any way to tell if it's an original configuration?

Darn I figured someone would have a general idea where the SN ...

Not so much a collector as an accumulator. Have a few 40-Xs I'd like to get more info on and a hand full of 22s. And then there's that Remington Mosin Nagant in the corner of the barn....