This item is not included in any spawn asset, but it doesn't necessarily mean that it doesn't spawn naturally on any of the maps.
MartiniBullet.dat
GUID f6cf574f9a2f4b439635989460e9a8a5
Type Magazine
Rarity Rare
ID 51917
Delete_Empty
Size_X 1
Size_Y 1
Size_Z 0.1
Amount 1
Count_Min 1
Count_Max 1
Delete
Calibers 1
Caliber_0 51015
Blueprints 1
Blueprint_0_Type Tool
Blueprint_0_Supplies 1
Blueprint_0_Supply_0_ID 51018
Blueprint_0_Supply_0_Amount 1
Blueprint_0_Tool 51218
Blueprint_0_Product 51917
Blueprint_0_Products 5
Blueprint_0_Build 27