阅读说明：本技术 中大口径高精度自动步枪活塞长行程导气反后座自动系统 (Automatic piston long-stroke air guide backseat system of medium-large-diameter high-precision automatic rifle ) 是由 姚树 于 2019-08-24 设计创作，主要内容包括：本次新设计的自动系统旨在解决中大口径自动步枪的高精度问题。以AK47自动突击步枪为参照,新的自动系统同样采用回转式闭锁枪机,制成的新自动步枪各系统除用本次发明的活塞长行程导气反后座自动系统替换AK47相对应的活塞长行程导气自动系统外,其它系统都可采用AK47步枪的成熟设计。在保留AK47步枪高可靠性的同时,通过新设计的导气反后座自动系统有效克服步枪发射时的后座力,从而大幅提高步枪连续射击时的稳定性和精度,进而实现隐身精确射击。本发明结构简单,制造生产容易,维护方便,适用于设计、制造具有高可靠性、高精度、高初速的各种中大口径自动、半自动突击步枪、狙击步枪、轻重机关枪、高射机枪和反器材步枪、反装甲步枪,以及各种口径的榴弹发射器和机关炮等轻武器,可以构成完整的中大口径自动枪械体系。(The automatic system newly designed at this time aims at solving the high-precision problem of the medium and large caliber automatic rifle. The AK47 automatic assault rifle is used as a reference, the new automatic system also adopts a rotary type locking rifle bolt, and the mature design of the AK47 rifle can be adopted in other systems except that the piston long-stroke air guide reverse backseat automatic system replaces the piston long-stroke air guide automatic system corresponding to the AK 47. When keeping AK47 rifle high reliability, recoil when effectively overcoming the rifle transmission through the anti-back seat automatic system of air guide of new design to stability and precision when improving the rifle continuous shooting by a wide margin, and then realize stealthy accurate shooting. The invention has simple structure, easy manufacture and production and convenient maintenance, is suitable for designing and manufacturing various light weapons with high reliability, high precision, high initial speed, such as medium and large caliber automatic and semi-automatic assault rifles, sniper rifles, light and heavy machine guns, high-speed machine guns, anti-equipment rifles, anti-armor rifles, grenade launchers and machine guns with various calibers, and can form a complete medium and large caliber automatic firearm system.)

1. The piston long stroke air guide recoil automatic system for automatic rifle with medium and large caliber and high precision is based on the principle that high air pressure generated by instantaneous gunpowder combustion during bullet firing is utilized to generate an impact force in the direction opposite to recoil force in a piston air duct connected with a gun barrel in parallel, a piston spring is compressed forwards to offset most recoil force, and then a bolt is pushed to move through a connecting rod and a bolt re-advancing spring, so that automatic shell throwing and bullet loading and firing circulation is realized.

The present invention differs from AK47 rifles in the features: firstly, the high-pressure gas generated by the combustion of the gunpowder at the moment of bullet shooting impacts forwards in the piston gas guide pipe and compresses the piston spring, and the direction of the high-pressure gas is opposite to the direction of recoil force. The moving directions of high-pressure gas in the gas guide pipes of other rifles are backward; and the air guide opening of the piston air guide pipe is close to the bullet shell and is arranged at the opening of the bullet shell. And the air guide port of the AK47 rifle is far away from the bullet shell and is arranged at the middle front part of the barrel; the third is that the bolt moves backwards and is pushed by the compressed piston spring, but not the high-pressure gas.