A trigger lock for a trigger of a firearm, components thereof, and associated methods. The trigger lock comprises a first guard including a bolt having a catch. The trigger lock includes a second guard comprising a bolt receiver configured to receive the bolt to connect the first and second guards with the trigger between the first and second guards for obstructing access to the trigger. The bolt receiver includes a keeper arranged to engage the catch when the bolt is in the bolt receiver to maintain the first and second guards connected to each other. The second guard includes a shield overlying the bolt receiver and configured to obstruct cutting of the bolt receiver to disengage the keeper from the at least one catch.