FIELD: small arms automatic systems, weapons equipment and automatic weapons systems. SUBSTANCE: the compensation method and device for bore opening optimizes the moment of breechblock release from blocking conformably to the specific features of the weapon design. The device has a compensating spring, which at a shot counteracts the pressure of powder gases for a certain period of time and only at a preset moment, being elastically deformed, through members of a kinematic chain releases the breechblock from blocking, for short-barrelled systems at compression, and for long-barrelled systems at release. The device makes it possible to manage without any breech carrier plate and its gas drive, which considerably reduces the mass of weapon of the respective types. The crankshaft-slider locking device represents a kinematic pair being in the "dead center". The device has an angle of turn of the crankshaft and connecting rod up to 180 degrees, which makes it possible to reduce the length of the locking levers and place them in the weapon casing. The device for mass balancing of movable parts is characterized by a kinematic link of the breechblock and balancing gear through racks and a toothed- wheel coupling them, made, for example, in the form of a pinion shaft; at the same time the balancing gear located over the breechblock and barrel. The longitudinal multiple-row magazine is featured by cutoffs locking the feed of cartridges from the subsequent section if they are available in the previous one. The submachine gun with a balancing gear has all the design features considered above, except for the longitudinal multiple- row magazine. The submachine gun with a balancing gear does not need any breech carrier plate and gas drive to it, which essentially reduces its mass. Loading and reloading in case of misfires are carried out by a breechblock control folding lever brought out to the front lower part of the fore grip. Release of the lever from the latch and withdrawal of the breechblock are carried out by one hand motion. The submachine gun with a longitudinal multiple-row magazine, using the "pull-up" principle, is characterized by a high balancing. The breechblock control lever brought out forward and located before the trigger bow provides for a high combat readiness at misfires. The submachine gun with a longitudinal multiple-row magazine is a highly balanced weapon. The use of the balancing gear essentially improves the combat efficiency of weapon of this type. The specific feature of the submachine gun is the provision of a jumping cartridge transition from the magazine to the cartridge chamber and a trigger bow- loader essentially enhancing its combat readiness at misfires. The use of a longitudinal double-row magazine located in the grip increases the single ammunition stock. The automatic pistol with a balancing gear is a service personal weapon with a high efficiency of fire. All operations of the firing process are ensured in it, including extraction of cartridges after a misfire only by one hand. The pistol uses a trigger-bow-loader, it has a single- and continuous-fire duties and two modification of it are available: with cocking and trigger mechanisms. The pistol is intended for use of the APS magazine. EFFECT: enhanced ballistic and operating characteristics of the new specimens of small arms of all types from machine guns to pistols. 46 cl, 21 dwg
