Design and operation of sight and its component parts

Spec Ops Shooting

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1.5.1. The sniper optical sight PSO-1 (Fig. 7) consists of the following main parts:

body;

objective; eyepiece; blind; eye shield;

knob with the scale of sight angles; knob with the scale of deflection corrections; handle;

colored glass; guide;

supply source; lamp; cap.

The objective in a mount with a collapsible blind is screwed into the body. The eyepiece in assembly with the eye shield is screwed into the body from another end.

On the top of the body is a knob with a sight angle scale plotted on its cylindrical portion. Inscriptions "BBepx" s "Upward", "BHN3" s "Downward", "CTn" s "MPI" and arrows, indicating the direction of the knob rotation when adjusting the sight are plotted on the knob nut.

The sight angle scale is provided with ten divisions (from 0 to 10).

The value of the scale division equals to 100 m. Beginning from division 3 it is possible to set sight angles every 50 m using the knob retainer.

On the right side of the body there is a knob with the scale of deflection corrections. The cylindrical portion of the knob is provided with 21 divisions (from 0 to 10 in both directions).

Dash lines and digits located to the right from 0 are of a black color, and those located to the left from 0 are of a red color.

The value of the scale division equals to 0S01. Deflection corrections may be set every 0-00.5 by means of the knob retainer.

1 - blind; 2 - objective; 3 - colored glass; 4 - handle; 5 - nut; 6 - knob; 7 - body; 8 -eyepiece; 9 - eye shield; 10 - cap; 11 - cap

1 - blind; 2 - objective; 3 - colored glass; 4 - handle; 5 - nut; 6 - knob; 7 - body; 8 -eyepiece; 9 - eye shield; 10 - cap; 11 - cap

Inscriptions "BnpaBo - To the Right", "BJieBo - To the Left", "CTn -MPI" and arrows, indicating the direction of rotation, when adjusting the sight are plotted on the nut fastening the knob of the deflection correction mechanism.

The band of the sight angle knob, as well as the band of the deflection correction knob each bears 60 divisions. The value of one division equals 0-00.5. Divisions on knob bands serve for reading the correction when adjusting the sight on the rifle.

The power source of the illuminating lamp is located in the seat of the body. The seat is covered with a cap.

1.5.2. The sight optical system is designed for obtaining images of objects located on the terrain and represents the monocular telescopic system with permanent magnification.

The optical system (Fig. 8) consists of objective lenses, reticle, reversing system, eyepiece lenses, screen, colored glass, light-orange glass and protective glass.

The objective is designed for obtaining the image of the observed object. In an objective focal plane an image is obtained reversed from the left to the right and from the top to the bottom.

The reversing system is intended to obtain the real correct image.

The eyepiece serves to inspect an observed image and reticle.

The light-orange colored glass improves contrast of an image in a dull weather.

The reticle represents a flat-parallel plate. The plate is provided with the scales of sight angles and deflection corrections as well as a range-finding scale. The field of vision view is shown in (Fig. 9).

Glass Reticle Plate

1, 2 - objective lenses; 3 - welded screen; 4 - reticle; 5, 6 -lenses (relay-lens); 7, 8 - eyepiece lenses; 9 - light-orange colored glass; 10 - colored glass; 11 - protective glass

The sight angle scale represents a number of angle marks up to the range of 1300 m. When setting the sight angle knob scale at division 10, the peak of the second from the top angle mark will correspond to the range of 1100 m, the peak of the third angle mark s to 1200 m, the peak of the forth angle mark s to 1300 m.

Monocular Dragunov

Plotted to the left and to the right from the angle marks is the scale of deflection corrections. The value of each division is 0-01.

The values of deflection corrections 0-05 and 0-10 are marked out by an elongated dash line.

The value of deflection correction 0-10 is marked out by an elongated dash line and designated by a digit 10. Two horizontal dash lines are plotted from the right and from the left of the deflection correction scale. The range-finding scale located from the left under the deflection correction scale serves for detecting the range up to the target. The range-finding scale represents two lines. The upper (curve) line is calculated for a target 1.7 m in height and is marked with digits 2, 4, 6, 8 and 10.

The sight reticle is displaced in two directions, which are perpendicular to each other, but it is always remains in an objective focal plane.

* Note. It is possible to complete the rifle with the sight of PSO-112 make without the screen, colored glass and handle.

1.6. Sniper rifle accessories

1.6.1. The sniper rifle accessories (Fig. 10) are used in disassembling, cleaning and lubricating the sniper rifle and are carried in the bag intended for the sight and magazines.

1.6.2. The set of accessories includes: a cheek plate, a cleaning rod, a scourer, a bristle brush, a screwdriver, a drift, a container and an oiler.

THE CHEEK PLATE is used when firing the rifle with the optical sight. In this case it is put on the rifle butt and fixed on the latter by means of the lock.

THE CLEANING ROD is used to clean and lubricate the barrel bore, passages and cavities of other parts of the rifle. The cleaning rod consists of three sections screwed to one another.

THE SCOURER is used for cleaning and lubricating the barrel bore as well as the passages and cavities of other rifle parts.

THE BRISTLE BRUSH is intended for cleaning the barrel bore with the RCHS solution.

THE SCREWDRIVER is used in disassembling, assembling the rifle and in cleaning the gas chamber and the gas tube. It is also used as a wrench to adjust the front sight position in height. THE DRIFT is used for driving the pins and studs out.

THE ACCESSORIES CONTAINER houses the scourer, the bristle brush, the screwdriver and the drift. It consists of two component parts: a container-wrench and a cover.

The container-wrench is used as a handle of the cleaning rod, when cleaning and lubricating the rifle and as a handle of the screwdriver when disassembling and assembling the rifle, and as a wrench when detaching the gas tube and assembling the cleaning rod.

THE CONTAINER COVER is used as a muzzle protector in cleaning the barrel.

THE OILER is used for storage of the lubricant.

Service Manual Gun

Fig. 10. Accessories to rifle:

1 - container cover; 2 - bristle brush; 3 - screwdriver; 4 - scourer; 5 - drift; 6 -container body; 7 - oiler; 8 - cheek plate; 9 - cleaning rod; 10 - cleaning rod extender; 11 - cleaning rod extender, front

Fig. 10. Accessories to rifle:

1 - container cover; 2 - bristle brush; 3 - screwdriver; 4 - scourer; 5 - drift; 6 -container body; 7 - oiler; 8 - cheek plate; 9 - cleaning rod; 10 - cleaning rod extender; 11 - cleaning rod extender, front

1.7. Individual SPTA set to sight

1.7.1. Individual SPTA set (Fig. 11) serves for providing normal functioning of the sight and replacement of separate failed parts.

1.7.2. Individual SPTA set includes: illuminating system, colored glass, wrench, napkin, supply sources, (sections cassette) and a cap.

** Notes. 1. One of the sections is placed into napkin is not shown conventionally.

Sniper Rifle

Fig. 11. Sight PSO-1 with individual SPTA set:

1 - wrench; 2 - sections of mercury-zinc cells 2RC63; 3 -colored glass; 4 - lamps CM 2.5-0.075 (in cassette); 5 -cap; 6 - illuminating system

Fig. 11. Sight PSO-1 with individual SPTA set:

1 - wrench; 2 - sections of mercury-zinc cells 2RC63; 3 -colored glass; 4 - lamps CM 2.5-0.075 (in cassette); 5 -cap; 6 - illuminating system

The illuminating system is intended for lighting the reticle when working with the sight at the environmental temperature below 0 grad. N. The wrench serves for screwing the reticle-illuminating lamp in and out. The napkin is intended for cleaning optical parts. Supply source, lamps and a cap are delivered as spare parts.

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