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.
Rifle_5.dat
GUID e4698d4dbe044bf8afdcac7b73748d9a
Type Magazine
ID 478
Size_X 1
Size_Y 1
Size_Z 0.2
Amount 5
Count_Min 2
Count_Max 4
Calibers 1
Caliber_0 17
Tracer 48
Blueprints 3
Blueprint_0_Type Ammo
Blueprint_0_Supplies 1
Blueprint_0_Supply_0_ID 44
Blueprint_0_Build 30
Blueprint_1_Type Ammo
Blueprint_1_Supplies 1
Blueprint_1_Supply_0_ID 478
Blueprint_1_Build 30
Blueprint_2_Type Tool
Blueprint_2_Supplies 1
Blueprint_2_Supply_0_ID 67
Blueprint_2_Supply_0_Amount 6
Blueprint_2_Level 1
Blueprint_2_Skill Craft
Blueprint_2_Build 27