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Firearms with a direct impingement design can, in principle, be constructed lighter than piston-operated designs. Because high-pressure gas acts directly upon the bolt and carrier in a direct impingement system, it does not need a separate gas cylinder, piston, and operating rod assembly of a conventional piston-operated system, only requiring a gas tube to channel gas from the barrel back ...
There are three basic types: long stroke gas piston (where the gas piston goes the same distance as the operating stroke of the action parts, and is often attached to the action parts), short stroke gas piston (where the gas piston travels a shorter distance than the operating stroke of the action parts), and direct impingement (AKA "direct gas ...
This internal piston action system designed by Eugene Stoner is commonly called a direct impingement system, but it does not utilize a conventional direct impingement system. In U.S. patent 2,951,424, the designer states: This invention is a true expanding gas system instead of the conventional impinging gas system. [56]
It is commonly called a direct impingement system, but it does not utilize a conventional direct impingement system. In U.S. patent 2,951,424, the designer states: ″This invention is a true expanding gas system instead of the conventional impinging gas system.″ Gas is routed from a port in the barrel through a gas tube, directly to a ...
The rifle features a short-stroke piston mechanism as opposed to the semi-direct impingement system of the AR-15. Gas flow is controlled by a four position regulator. Several key parts, such as the gas piston, gas regulator, and bolt/carrier group are chrome plated. The bolt carrier features an integral lug in place of the AR-15's gas key.
The 1956 U.S. patent 2,951,424 by Eugene Stoner describes the cycling mechanism used in the Armalite AR-10 rifle that is common with rifles that use the Stoner "Direct Impingement" gas operated bolt and carrier system including Colt AR-15s. The bolt carrier acts as a movable cylinder and the bolt itself acts as a piston.
With no time to develop a new weapon, ADD made one based on the XB rifle prototypes called XB-S (short). It used a direct impingement gas tube rather than a piston to achieve the required short length, which was faster to make since they had short-barrel CAR-15 designs to work off of and no time to redesign a new short gas piston. The barrel ...
The direct impingement gas system was first applied in 1901 to a 6 mm (0.24 in) semi-automatic experimental rifle (the ENT B-5) designed by Rossignol for the French military. [1] Although several experimental prototypes using a tilting bolt and direct impingement had been tested by MAS since 1924, the immediate precursor to the MAS 7.5mm semi ...
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