The item id for Frost FAMAS Sight in unturned is 36543. 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.
Blueprints: 2
Blueprint_0_Type: Utilities
Blueprint_0_Supply_0_ID: 36543
Blueprint_0_Build: 27
Blueprint_0_Outputs: 1
Blueprint_0_Output_0_ID: 36011
Blueprint_0_Output_0_Amount: 1
Blueprint_0_Conditions: 1
Blueprint_0_Condition_0_Type: Flag_Short
Blueprint_0_Condition_0_ID: 36013
Blueprint_0_Condition_0_Value: 0
Blueprint_0_Condition_0_Logic: Equal
Blueprint_1_Type: Utilities
Blueprint_1_Supply_0_ID: 36543
Blueprint_1_Build: 27
Blueprint_1_Outputs: 1
Blueprint_1_Output_0_ID: 36011
Blueprint_1_Output_0_Amount: 2
Blueprint_1_Conditions: 1
Blueprint_1_Condition_0_Type: Flag_Short
Blueprint_1_Condition_0_ID: 36013
Blueprint_1_Condition_0_Value: 1
Blueprint_1_Condition_0_Logic: Equal