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_Flechette_3.dat
GUID 19c1053e7efa4c06bacf66811c511fae
Type Magazine
Rarity Rare
ID 6989
Size_X 1
Size_Y 1
Amount 3
Count_Min 2
Count_Max 3
Calibers 1
Caliber_0 6400
Spread 0.8
Pellets 6
Damage 1.5
Tracer 4054
Player_Damage_Bleeding Always
Blueprints 5
// Flechette
Blueprint_0_Type Ammo
Blueprint_0_Supplies 1
Blueprint_0_Supply_0_ID 4199
Blueprint_0_Build 4180
// Flechette Ammo Box
Blueprint_1_Type Ammo
Blueprint_1_Supplies 1
Blueprint_1_Supply_0_ID 6986
Blueprint_1_Build 4180
// Flechette 3rnd (This)
Blueprint_2_Type Ammo
Blueprint_2_Supplies 1
Blueprint_2_Supply_0_ID 6989
Blueprint_2_Build 4180
// Flechette 7rnd
Blueprint_3_Type Ammo
Blueprint_3_Supplies 1
Blueprint_3_Supply_0_ID 6990
Blueprint_3_Build 4180
// Flechette Speedloader
Blueprint_4_Type Ammo
Blueprint_4_Supplies 1
Blueprint_4_Supply_0_ID 6993
Blueprint_4_Build 4180