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Non-exploding infantry hardware thread.


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   Stolen from Yuri Pasholok, sappers at Army 2021 showed some of their gear. One of shown devices was PIPL - detector of wires for bombs/mines/IEDs. Can detect 0.2 meter long wire at depth of 30 sm. 3.7 kg device itself, in transport case - 11.6 kg. Can work for 8 hours on 6 AA batteries, 5 mins to prepare for work.

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On 12/13/2019 at 1:52 AM, LoooSeR said:

   Somebody decided to mount optical sight from RPG-7V ("PGO-7V", 2.7x) on AK (both 5.45 and 7.62), like some of Soviet Army soldiers did in A-stan and find out how to use it and why people were doing that.

https://gunsforum.com/topic/2291-granatomyotnyy-pritsel-pgo-7v-na-aksaygu/

 

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   Using ballistic tables and empirical data they figured out ranges/zero/holdovers for PGO-7V using both 5.45 and 7.62

   For 5.45 it looks like this ("crosshair" is at 300, was zeroed to this range)

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   7.62x39

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   Rangefinder shows range to a target that are 2.7 meters high (AFVs), works for humans ~1.7 meters high if you decrease resulting range by 100 meters.

   Probable reasons to use this sight is slightly lower magnification that gives better view on ranges where AK are effective, relatively easy to use and this sight was avaliable at the time for some of soldiers to put on their rifles. It also have illuminated reticle (although it will be hard to find proper battery, owner of the sight in the post re-made it for AAA battery) and sight is small enough to not obscure iron sights.

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   Pavel Ptitsin made an article about Soviet prototype sights AP-1 and AP-2 which were based on RPG-7 sight from post above.

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   Experimental prismatic sights AP-1 and AP-2 were created on the basis of the serial produced grenade launcher sight PGO-7V, they differed from it in the layout and design of the alignment mechanism, which made it possible to adjust the aimed fire of the AK74N (AKS74N) assault rifle. 

 

   AP-1 and AP-2, and both sights on AK-74N:

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AP-1

Magnification - 2.7x. 

Angle of view - 13°

Exit objective diameter - 4.6 mm

Length - 205 mm, Height - 140 mm, Width - 110 mm, Weight - 470 g


AP-2

Magnification - 2.6x. 

Angle of view - 13°

Exit objective diameter - 4.5 mm

Length - 205 mm, Height - 170 mm, Width - 100 mm, Weight - 500 g 

 

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Determination of the accuracy of fire

   During the tests, the accuracy of the AK74N assault rifle was determined with and without sights AP-1, AP-2.

   Testing with single shot fire was carried out at a distance of 100 m and 300 m. The determination of the accuracy of fire with automatic fire was carried out from various positions: from the “prone position with a resting under the handguard” at a distance of 100 m; from the position “lying from the hand” at a distance of 50 m and “standing from the hand” at a distance of 25 m.

   The tests were carried out by shooters of various qualifications. For each case, 3 series of 20 shots were carried out. 

 

 

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   The table shows that the experiment AP-1 and AP-2 sights improve the accuracy of fire from all positions, except for automatic fire at a distance of 100 m from the “prone position with a resting under the handguard”. The deterioration of the accuracy characteristics was explained by the less stable position of the tester when shooting with optical sights compared to the position of his body when firing with an open sight, which was due to the higher aiming line of the AP-1 and AP-2 sights compared to the open sight.

   The lateral dispersion of the Sb (Sv is vertical dispersion) accuracy when firing with automatic fire with the AP-1 sight is greater than with the AP-2 sight. From this it followed that the layout of the AP-2 sight made it possible to bring the center of mass of the assault rifle-sight system to a more favorable position for firing.

   The maximum movement of the sight relative to the tester's eye during automatic fire was 13 mm. Consequently, with proper preparation for firing, the distance between exit lense of the sights and shooter eye (30 mm) is sufficient for normal firing from the AK74N assault rifle.

   The magnification in the optical system is sufficient for firing at a distance of up to 500 m.

   The location of the handwheel for lateral corrections is more convenient for working with the AP-2 sight. 

 

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Conclusion on the results of tests

   Experimental sights AP-1, AP-2, which passed tests on the AK74N assault rifle for accuracy of fire, showed an improvement in accuracy characteristics compared to an open sight.

   The layout of the AP-2 experimental sight is the most successful for aimed fire from the AK74N assault rifle.

   Samples of sights developed on the basis of the AP-2 experimental device can be used for operation on the AK74N assault rifle.

   Continue work to eliminate the aforementioned shortcomings of the AP-1, AP-2 sights. 

 

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