Obviously I have hand guns and more than a few....Now that's out of the way!  All I can say is that even with a safe, I have found that trigger locks provide great peace of mind in preventing unauthorized people from using your firearm.  These master keyed "Master Locks" work extremely well and fit all my firearms.  I would highly recommend purchasing these locks.  I know there are some that don't like to use these locks and I wouldn't recommend this lock if your intention is to keep your home defense firearm locked with the hopes of unlocking it if or when someone is breaking into your house.  If that's your thought then I would highly suggest that you rethink that position and I would say this product is not for you.  But if you have several firearms and you are going to put them up or store them.  Then this is an extra level of security assuming that you are using a safe.  Anyway, this is a solid product that is very very easy to use.