Ranger grade Launcher rocket.
The item id for Rocket 1 in unturned is 520. You can use this ID with the commands below to spawn the item, give it to a player or buy it on a modded economy server.
Size_X: 2
Size_Y: 1
Size_Z: 0.225
Amount: 1
Calibers: 1
Caliber_0: 20
Blueprints: 1
Blueprint_0_Type: Tool
Blueprint_0_Supplies: 2
Blueprint_0_Supply_0_ID: 73
Blueprint_0_Supply_0_Amount: 1
Blueprint_0_Supply_1_ID: 1241
Blueprint_0_Supply_1_Amount: 1
Blueprint_0_Level: 2
Blueprint_0_Skill: Craft
Blueprint_0_Build: 32