A gun lock system for securing a firearm to a buckle receiver assembly. The gun lock system comprises the buckle receiver assembly and a buckle tongue assembly. The gun lock system comprises buckle receiver and the buckle tongue assembly comprises a tongue. The tongue and the buckle receiver are configured to selectively connect to one another. The buckle receiver assembly comprises a mounting extension, the buckle receiver, a locking system, and a fastener receiver. A fastener comprises a tamper proof bolt. A swivel mount is mounted directly to a portion of the firearm. A swivel portion of the swivel mount can allow the buckle tongue assembly to rotate and move freely.