Perfect practice makes perfect, and a training regimen should vary to include live and dry fire. Above all else is safety, so when you are not at the live fire range and are training with dry fire, safety is paramount,
Chamber flags are a great indicator that a firearm is clear; however, they must be removed for dry fire as they keep the slide or bolt out of battery. Enter BarrelBlok. A chamber flag sticks out of the muzzle instead of the ejection port allowing for dry fire and keeping the chamber flag in place.
You can see the BarrelBlok protruding from the muzzle of my CZ SP 01 Tactical, as reviewed here, and the Dan Wesson Specialist, as reviewed here. You will also notice the MagBlok half round loaded in the magazine. This allows you to rack the slide with the follower engaging the slide stop, but since they are only half rounds, the slide will not pick them up. This system works excellent for dry fire or drawing from a holster while showing clear and allowing manipulation of the slide and magazine without engaging the slide stop.
For about $13 for the handgun line of BarrelBlok and MagBlok, it is an inexpensive addition to your training toolbox. BarrelBlok offers this kit in all the popular autoloading cartridges and many popular rifle calibers as well.