If you have multiple firearms and must use one, use combo locks and reset them all to the same number.
Mine are all set to open at 000, but I keep them dialed to 001.
Takes one quick flip of the 3rd number to open them.
[video=youtube_share;_JNGI1dI-e8]http://youtu.be/_JNGI1dI-e8[/video]