Operating The Bolt
Typically, the bolt consists of a tube of metal inside of which the firing mechanism is housed, and which has at the front or rear of the tube several metal knobs, or "lugs", which serve to lock the bolt in place. The operation can be done via a rotating bolt, a lever, cam-action, locking piece, or a number of systems. For example, one setup is a straight-pull design, such as the German Blaser R93 Tactical. Straight-pull designs have seen a great deal of use, though manual turn-bolt designs are what is most commonly thought of in reference to a bolt-action design due to the type ubiquity. As a result the bolt-action term is often reserved for more modern types of rotating bolt-designs when talking about a specific weapon's type of action, however both straight-pull and rotating bolt rifles are types of bolt-action rifles. Lever-action and pump-action weapons must still operate the bolt, but they are usually grouped separately from bolt-actions that are operated by a handle directly attached to a rotating bolt. Early bolt-action designs, such as the Dreyse needle gun and the Mauser Model 1871, locked by dropping the bolt handle or bolt guide rib into a notch in the receiver, this method is still used in .22 rimfire rifles. The most common locking method is a rotating bolt with two lugs on the bolt head, which was used by the Lebel Model 1886 rifle, Model 1888 Commission Rifle, Mauser M 98, Mosin–Nagant and most bolt action rifles. The Lee-Enfield has a lug and guide rib, which lock on the rear end of the bolt into the receiver.
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