Maybe I'm not as smart as I think I am... but it didn't occur to me that these would not fit well on my rifles.  Wanting to add an additional layer of protection, I bought this pack with the intention of fitting them to rifle trigger guards.  I think the biggest problem is the "one size fits all philosophy", which clearly doesn't work on something that has to fit perfectly to work.  On every one I was able to twist the lock rather easily and engage the trigger.  I will go back to cable locks, as ugly as they are, because they are not open to this kind of manipulation.