Rimfire Firearms: Dry firing rimfire guns (such as .22 caliber) can damage the firing pin and chamber since the firing pin strikes the edge of the chamber when no cartridge is present.
Older Firearms: Vintage or antique guns may have more delicate mechanisms that can be damaged by dry firing.
Specialized Competition Guns: Some competition firearms are finely tuned and may not be suited for extensive dry firing without specific modifications or precautions.