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.
StrikeGatling.dat
GUID b2372614134c4c4d91041eb7e819db65
Type Magazine
Rarity Mythical
ID 51037
Size_X 2
Size_Y 2
Size_Z 0.1
Amount 1
Count_Min 1
Count_Max 1
Spawn_Explosion_On_Dedicated_Server True
Calibers 1
Caliber_0 51050
Tracer 55
Range 3
Player_Damage 0
Zombie_Damage 0
Animal_Damage 0
Barricade_Damage 0
Structure_Damage 0
Vehicle_Damage 0
Resource_Damage 0
Object_Damage 0
Explosion 51058
Explosive
Use_Auto_Stat_Descriptions False
Delete_Empty
Blueprints 1
Blueprint_0_Type Tool
Blueprint_0_Supplies 4
// Blank Module
Blueprint_0_Supply_0_ID 51329
Blueprint_0_Supply_0_Amount 1
Blueprint_0_Supply_0_Critical
// Charges
Blueprint_0_Supply_1_ID 51308
Blueprint_0_Supply_1_Amount 1
// Adhesive Compound
Blueprint_0_Supply_2_ID 51061
Blueprint_0_Supply_2_Amount 1
// Blue Fuse
Blueprint_0_Supply_3_ID 52310
Blueprint_0_Supply_3_Amount 1
Blueprint_0_Product 51037
Blueprint_0_Build 27