The item id for Metro LMG Sight in unturned is 57147. 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: 1
Size_Y: 1
Size_Z: 0.075
Asset_Bundle_Version: 3
Blueprints: 1
Blueprint_0_Type: Tool
Blueprint_0_Supplies: 1
Blueprint_0_Supply_0_ID: 57147
Blueprint_0_Outputs: 1
Blueprint_0_Output_0_ID: 67
Blueprint_0_Output_0_Amount: 1
Blueprint_0_Build: 27