it's part of the serial number
On the butt
On the butt.
The butt
look on the bottom of the butt for the serial number............................
The butt.
On the butt
CHeck the butt.
Check the butt of the weapon.
Look on the butt.
That is not the serial number. You are looking inside the crane, but the serial number is on the butt.
Check on the butt and backstrap
Check the butt