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Every Firearm Is Open Bolt: Difference between revisions

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AutomaticSemi-automatic and automatic firearms have two main methods of operation: Open Bolt and Closed Bolt. In an open bolt system, the bolt is back when inactive and goes forward to fire then driven back to its initial position by the firing. In a closed bolt system the bolt is driven backwards, then forward. Most modern firearms, with the exception of some (sub)machine guns, are closed bolt or a hybrid as are nearly all civilian legal firearms.
 
While these systems have a large host of differences in reliability, accuracy, fire rate, fire modes, compatibility with interrupter gears, and legal regulations (making an open bolt firearm full auto proof is extremely difficult) the most obvious difference between the two for an end user is the ability for closed bolt firearms to hold an extra round in the chamber. This extra cartridge persists across magazine changes and is referred to as "+1" when dealing with capacity (30+1). When reloading with a round left in the chamber the current magazine only needs to be ejected and replaced, with none of the other controls needing to be touched. Ignorance of the +1 has lead to [[I Just Shot Marvin in the Face|the injury and death of many people for fail to obey the four rules]] and didn't realize it can fire with the magazine removed, especially among [[Bad Cop, Incompetent Cop|poorly trained police]] and untrained civilians. This has led to laws mandating loaded chamber indicators, magazine disconnect safeties and ugly white "caution-capable of firing with magazine removed" markings on firearms.
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