图为一款AR15系步枪连发射击场景。从图中可以看出,采用了内置式消声器的短枪管型AR15步枪在连发射击状态下基本看不到枪口焰,然而机匣上方却出现了火药燃气形成的大团烟雾,这恰恰表明气吹式导气系统的弊端。导气管喷出的大量火药燃气从抛壳窗排出,不仅会呛鼻熏眼,还会阻碍射手的视线,影响射击。另外,枪械长期使用会造成枪机内部积碳,影响武器的可靠性。 The picture shows a AR15 series rifle firing shot scene. As can be seen from the figure, the short barrel AR15 with built-in muffler basically can not see the muzzle flame in the continuous firing state, however, the large fume formed by the powder of gunpowder appears above the casing, which shows exactly Air-blown air conduction system defects. A large number of gunpowder gas emitted from the shell and window exhaust, not only will choke nose smoked, but also obstruct the shooter’s sight, affecting the shooting. In addition, the long-term use of firearms will lead to internal carbon deposition, affecting the reliability of weapons.