One thing which hasn't been mentioned, yet, is timing. Many folks assume a new gun will work perfectly (and that if it does, it will stay that way.) A revolver which cocks before it locks, even if it's very close to locked, will still have great potential to spit. My Rugers are all good about locking up, usually well before they cock. I did have another brand though, which would lock fine if used quite normally even though the hammer cocked before the cyclinder locked. In normal, brisk use, the momentum of the cylinder carried it around. In very deliberate slow cocking the hammer could be cocked without the cylinder rotating far enough to lock. If the hammer were pulled all the way down, the cylinder would lock. The bottom line was that the revolver - a pricier one than the Rugers- had some serious potential to spit due to poor timing. I'm sure that wasn't an isolated example. For the sake of those who shoot with others present nearby - as well as for your own wellbeing- checking and keeping track of wear (or dirt) which may affect proper function of a revolver is probably a stellar idea.