The recall is for one specific serial number range.
P1 - 3K00001 to 3K00601
K100 - 1K00001 to 1K01001
If your P1 or K100 has a serial number outside this range, don't worry, it doesn't apply to you.
If you have a gun in this range, please stop using it until you contact Century Arms.
I've updated the serial number ranges. The original document seems to have inverted the ranges for the P1 and K100.