Sivuperäsimeen

Sivuperäsimeen is a Finnish term that translates to "side-cocking" or "side-charging" in English. It refers to a specific mechanism found on some firearms, particularly rifles, where the bolt handle is located on the side of the receiver rather than the traditional top or rear position. This design offers several advantages, primarily related to faster and more ergonomic operation of the bolt.

The primary benefit of a sivuperäsimeen is the ability for the shooter to cycle the action without removing their shooting hand from the grip or their eye from the sighting plane. This can significantly speed up reloads or clearing malfunctions, as the user can maintain better control and focus on the target. In some cases, it also allows for a lower optic mounting position, as the charging handle does not interfere with the scope.

Sivuperäsimeen mechanisms are not as common as traditional top- or rear-mounted charging handles. They are often found on modern sporting rifles, particularly those designed for competitive shooting or tactical applications where rapid manipulation of the action is paramount. The design can vary between manufacturers, with some featuring non-reciprocating handles (meaning the handle does not move with the bolt carrier) and others that do. The inclusion of a sivuperäsimeen is a design choice that can influence the overall ergonomics and operational efficiency of a firearm.