These are collectors item,limited run made for colt canada in 2014.
no more will be made
The Magazine Lock is inserted into the magazine well of your favorite AR-style rifle. The relatively unobtrusive red plastic block renders the weapon safe and impossible to use until removed, locking the two receivers together. Compared to trigger locks, the Magazine Lock does not allow anyone to insert a magazine or chamber a round, which an improperly set up trigger lock could fire.
When not in use, the keys to the Magazine Lock cannot be removed unless the unit is in the locked position.
Locks upper & lower receiver together
Protection against burglary
Protection against unauthorized use
Visual check for empty chamber
Gasket to prevent dust and ensure cleanliness
Improved transportation safety
Includes two security keys and key identification card