How a RPD Machine Gun Works

Wikipedia: The RPD (Russian: ручной пулемёт Дегтярёва, romanized: Ruchnoy Pulemyot Degtyaryova, English: Degtyaryov hand-held machine gun) is a 7.62x39mm light machine gun developed in the Soviet Union by Vasily Degtyaryov for the 7.62×39mm M43 intermediate cartridge. It was created as a replacement for the DP machine gun chambered for the 7.62×54mmR round. It is a precursor of most squad automatic weapons.[1] It was succeeded in Soviet service by the RPK.
Type
Light machine gun
Squad automatic weapon
Place of origin Soviet Union
Service history
In service 1944-1961 (Soviet Union)
1944-present (other states)
Used by See Users
Wars See Wars
Production history
Designer Vasily Degtyaryov
Designed 1943-44
Produced 1944-1960
Variants RPDM, Type 56, Type 56-1, Type 62
Specifications
Mass 7.4 kg (16.31 lb) when empty
Length 1,037 mm (40.8 in)
Barrel length 520 mm (20.5 in)
Cartridge 7.62×39mm
5.56×45mm NATO (Israeli conversion)
Action Gas operated long stroke piston, flapper locking and fires from the open bolt
Rate of fire 650 rounds/min
Muzzle velocity 735 m/s (2,411 ft/s)
Effective firing range 100-1,000 m sight adjustments
Feed system Non-disintegrating 100-round segmented belt stored in a drum container
Sights Open-type sights with rear sliding notch and semi-hooded front post, 596.6 mm (23.5 in) sight radius

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What software do you use to do that?

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World of Guns: Gun Disassembly