WEAPONS INFORMATION NOTICE,
CORRECTING PROPERTY BOOK MISTAKES
CLASSIFICATION: UNCLASSIFIED (750-1B)
MSG DTG: MARCH 12 2009
SUBJECT: MK19 Machine Gun.... CORRECTING PROPERTY BOOK MISTAKES
Almost half of the MK 19 machine gun serial numbers being recorded in property books or unique item tracking
(UIT) are wrong. These property book mistakes will come back and bite armorers when it’s time for inventory or turnin.
The usual mistake is adding the date stamp or extra zeroes to the serial number. Here’s how to correctly read the ID
stamp on the left-side of the receiver using this example:
Line 1: Gun 40mm
Line 2: MK 19 MOD 3
Line 3: 10001 (cage code) and 3269400-M (part number)
Line 4: 12345 (four or five digit serial number) and 0196 (month and year of manufacture)
Line 5: US The serial number is 12345 not 123450196.
NSN Changes with MWO
Another common property book mistake is not changing the MK 19's NSN after MWO 9-1010-230-50-1 has been
applied. The NSN should be changed from 1010-01-126-9063 to 1010-01-490-9697. LIN M92362 stays the same, but
“-M” must be added to the part number.
How do you tell if the MWO has been applied? The MK 19 will have five holes drilled on the right side of the
receiver, a new sight mounting bracket, new firing pin, new firing pin sear, a two-piece cocking lever, and adjustable
secondary drive assembly. If your MK 19s haven’t been modified, notify your MWO officer. The MWO should have
been completed by June 07.
To report a serial number or NSN change to the LOGSA small arms registry, units using PBUSE need to do an asset
adjustment report (AAR) for serial numbers or an asset description update (ADU) for NSNs. Units that don’t use
PBUSE should submit a TRAC K to the LOGSA Unique Item Tracking (WebUIT) database:
This should go through your serialization officer (SO) if you have one. For help with the WebUIT, email:
For questions about the NSN or serial number...