BLUF: When changing out a lower receiver, make sure to complete the paperwork to change the serial number on the property book.
The approach to small arms weapons maintenance is changing, allowing more tasks to be performed at field level. Today, the lower receiver on some
weapons can be replaced by the field-level 91F; however, always check the specific weapon TM to see if changing the lower receiver is authorized at the field level.
Maintainers, because the lower receiver contains the weapon serial number, every time one is replaced, make sure to complete the required paperwork
. Reference Chapter 4-12 (b) of DA PAM 710-2-1. The paperwork (DA Form 4949 and SAMS Form 2470E or GCSS-A Form 5990) must be turned in to the property book office so the change can be made on the property book.