In addition to questions of safety and durability are issues of reliability and usability. Since +P cartridges may generate a significantly different quality of recoil, this can affect firearm function. For example, recoil operated firearms may fail to function if the velocity of the recoiling parts is too high; in lightweight revolvers, the cartridge case may recoil away from the bullet with sufficient force to overcome the crimp, allowing the bullet to move forward in the cylinder and causing the cylinder to bind. The increased velocities and pressures of a +P loading will increase muzzle blast and recoil, and may prove difficult to handle for many shooters; these problems are exacerbated by compact, lightweight guns with short barrels.