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_Buckshot_3.dat
GUID ca00ec52fc75496eb15e0757ea6f1c1f
Type Magazine
Rarity Rare
ID 6401
Size_X 1
Size_Y 1
Amount 3
Count_Min 2
Count_Max 3
Calibers 1
Caliber_0 6400
Pellets 8
Tracer 48
Blueprints 3
// Buckshots
Blueprint_0_Type Ammo
Blueprint_0_Supplies 1
Blueprint_0_Supply_0_ID 4198
Blueprint_0_Build 4180
// Buckshot 3rnd (This)
Blueprint_1_Type Ammo
Blueprint_1_Supplies 1
Blueprint_1_Supply_0_ID 6401
Blueprint_1_Build 4180
// Buckshot 7rnd
Blueprint_2_Type Ammo
Blueprint_2_Supplies 1
Blueprint_2_Supply_0_ID 6402
Blueprint_2_Build 4180