A safety lock for a firearm comprises a casing, a releasable locking member at a second end, and a flexible member between the first end and the second end. When the lock is installed on the firearm, the lock extends along the barrel from the chamber to the muzzle end. When in the locked position, the casing is positioned in the chamber and the flexible member extends along the barrel, an ammunition round from being loaded. The safety lock allows a user to dry fire the firearm.