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Polish BMP-1 mods

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BWP-40 (or BMP-40 if you wish), modernization was purely focused on improving firepower by installing CV9040 turret armed with Bofors 40mm L70. However such configuration was too heavy and too big, also amount of ammunition taken for the gun was low. Dismounts quantity was reduced and vehicle if I am not mistaken, could not swim anymore.

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A very rare photo (and the only one I could find in the internet) of the so called BMP-95, modernization was focused on improving survivability and firepower.
 
The old turret was replaced with a new one, armed with 23mm auto cannon, a 7,62mm machine gun and SPG-9. These modules we can see on hull and turret, are explosive reactive armor with ceramic backing CERAWA-1 providing protection against 14,5mm armor piercing ammunition and shaped charge warheads capable to penetrate 300mm of armor.
 
The obvious question is why CERAWA-1 modules are not better covering hull, my theory is that this was weight compromise.
 
Sources I have say that during tests, it was discovered by some proposed armor improvements decreased amphibious capabilities by 4% (this means armor from 1 to 2 tons heavy), this ended with hull top completely underwater and was unacceptable. CERAWA-1 in this configuration increased weight only by approx 900kg's.
 
There were also considered (or perhaps even performed tests) with installation of ERAWA-1 explosive reactive armor designed for T-72 tanks modernization. However such protection was considered as too heavy, and additional concern was that ERAWA-1 detonation might end up with cracks in BMP-1 hull.
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BMP-2 with Berezhok turret.

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Firing Kornet ATGM

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30 mm autocannon

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Shturm TD/ATGM vehicle

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BTR-82A firing 30 mm AC

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New Tigr with Kornet ATGMs, was showed at this year Victory Parade.

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Pantsir

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Upgraded Strela-10

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