Sniper rifles often have a mechanism that works as a bolt-action or semi-automatic (usually reloaded by recoil or loaded with compressed air), depending on the specific needs of the use. Sniper that active structure will be chosen to craft, each with its own strengths and weaknesses.With a certain type of ammunition, the sliding barrel locking mechanism makes manufacturing easy, cheap, easy to maintain and light because there are few machine parts. In addition, not automatically pushing the shell out will reduce the sniper’s position when the shells are flying out, and it will be more accurate because there is no moving details causing angle aim (even very small) or slow down the projectile speed because some of the gas will be extracted for reload if it is semi-automatic. However, the rate of fire will be quite slow and depends on the skills of the gunners.
With a semi-automatic mechanism, the rate of fire can be very fast. When needed, it can be turned into a close-range fighting gun because its high rate of fire can increase its chances of hitting a target and can react faster in an emergency situation. But in return it will be heavier and more difficult to maintain because there are more machine details than a normal bolt and less accurate when shot far.
See more at: Warning you are no longer trespassing you are a target poster
