When performing dry-fire practice with an AR-15, there are a lot of reasons you might not want the bolt to lock to the rear. You can use dummy rounds, snap caps or other safety aids, but there’s another trick used in training circles requiring far less investment.
From the archives of American Rifleman, NRA member writes: I am confused about the proper handling of hammerless shotguns. Everyone has heard the advice “never dry-fire a gun, the firing pmay break.” If the gun has an exposed hammer, it can be eased down, but how should I handle a hammerless single- or double-barreled gun. Should I leave a spent shell or snap-cap in the chamber?
For those who own and carry a double-action revolver, dry-fire practice can help build skills with trigger control and improve accuracy.