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.
CA_Subsonic_30.dat
GUID 2dc634f4affc4466b3b60e8467c34f3c
Type Magazine
Rarity Epic
ID 4844
Size_X 1
Size_Y 2
Amount 30
Count_Min 15
Count_Max 30
Calibers 1
Caliber_0 4804
Tracer 4054
Blueprints 4
Blueprint_0_Type Ammo
Blueprint_0_Supplies 1
Blueprint_0_Supply_0_ID 4145
Blueprint_0_Build 4180
Blueprint_1_Type Ammo
Blueprint_1_Supplies 1
Blueprint_1_Supply_0_ID 4146
Blueprint_1_Build 4180
Blueprint_2_Type Ammo
Blueprint_2_Supplies 1
Blueprint_2_Supply_0_ID 4805
Blueprint_2_Build 4180
Blueprint_3_Type Ammo
Blueprint_3_Supplies 1
Blueprint_3_Supply_0_ID 4844
Blueprint_3_Build 4180