Abstract: A breech block firearm safety device for the prevention of injury to children having unauthorized access to loaded firearms. This device will also protect gun owners from injury due to mishandling or the dropping a loaded weapon. The safety device utilizes a two piece blocking assembly having a breech member and a bore member. The breech member is inserted into the breech just as you would insert a live round to arm a weapon. The bore member is inserted into the muzzle of the firearm and screw connected to the breech member using special tooling. The chamber blocking assembly can be easily extracted but the overall length is such that the end of the bore member remains in the breech making ejection impossible. The assembly can only be returned to the breech, making manual or automatic loading of live ammunition impossible. When the above safety device is installed in a revolver the overall length prevents the rotation of the cylinder and prevents the loading of live ammunition into firing position.

Abstract: A gun lock assembly formed of two major components, a chamber blocking rod member and a locking rod member. The chamber blocking rod member has a shank portion that is longer than the gun barrel to be blocked and a 90 degree extension terminating in a closed loop. The locking rod member has an open end and and a locking aperture end. The opening in the open loop is of sufficient width to accept the smaller of the cross sectional dimensions of the the trigger guard and the locking aperture end is sized to be introduced into the closed loop of the blocking rod member. The open loop of the locking rod is assembled to the trigger guard and the locking end is introduced into the closed loop and locked. The blocking rod member can not be removed without unlocking and removing the lock.