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For example, gas-operated shotguns are widely held to have a "softer" recoil than fixed breech or recoil-operated guns (although many semi-automatic recoil and gas-operated guns incorporate recoil buffer systems into the stock that effectively spread out peak felt recoil forces.) In a gas-operated gun, the bolt is accelerated rearwards by ...
Ready to fire position. Bolt is locked to barrel, both are fully forward. Recoil of firing forces bolt and barrel fully to the rear, compressing the return springs for both. Bolt is held to rear, while barrel unlocks and returns to battery under spring force. Fired round is ejected. Bolt returns under spring force, loads new round.
Fuel-controlled fire: Free burning of a fire that is characterised by an air supply in excess of that which is required for complete combustion of the fuel source or available pyrolates. Fully engulfed: Term of size-up meaning fire, heat and smoke in a structure are so widespread that internal access must wait until fire streams can be applied.
A fire that spreads slowly and burns with a low flame. crown fire A fire that advances between the tops of trees or shrubs more or less independently of a fire on the ground surface. Crown fires are sometimes classed as running or dependent to distinguish the degree of independence from the surface fire. crown out See torching.
After a fire reaches 100% containment — which can take months, depending on the weather conditions, the blaze’s size and the area’s topography — crews work toward declaring the fire ...
Some selective fire weapons utilize burst fire mechanisms to limit the maximum or total number of shots fired automatically in this mode. The most common limits are two or three rounds per pull of the trigger. Selector: The part of a selective fire weapon that allows the user to choose their desired mode of firing.
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