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Description
Fun fact:
The Heckler & Koch MP5SD (German; Maschinenpistole 5 Schalldämpfer) is an MP5 that features an integral suppressor. The suppressor itself is divided into two stages; the initial segment surrounding the ported barrel serves as an expansion chamber for the propellant gases, reducing gas pressure to slow the projectile to subsonic speeds. The actual suppressor occupies the remaining length of the barrel and contains a stamped metal helix separator with several compartments which allows the gas to expand and further decrease both its pressure and temperature. Finally, it deflects the gases as they exit the muzzle, muffling the exit report. As bullet leaves the muzzle at subsonic velocity it doesn't generate a sonic shock wave in flight like other guns which further decreases the sound produced. As a result of reducing the barrel’s length and the venting propellant gases in the first segment of the suppressor, the bullet’s muzzle velocity drops in the range of 16-26% (depending on the ammunition used) while maintaining the weapon’s reliability. The weapon was intended to be used with either subsonic ammunition or standard supersonic ammunition while maintaining the same level of sound suppression.

In 1974, Heckler & Koch started to work on a suppressed version of the MP5. Through the years, they developed variants of them like the MP5SD1/D4 (both featuring a receiver end rather than having a buttstock), the MP5SD2 (which is the actual model in-game)/D5 (they included a fixed buttstock), and others.

Source: roblox-phantom-forces.fandom.c…

Imagine source: hk-usa.com/hk-models/mp5sd/

Description
Fun fact:
The Heckler & Koch MP5SD (German; Maschinenpistole 5 Schalldämpfer) is an MP5 that features an integral suppressor. The suppressor itself is divided into two stages; the initial segment surrounding the ported barrel serves as an expansion chamber for the propellant gases, reducing gas pressure to slow the projectile to subsonic speeds. The actual suppressor occupies the remaining length of the barrel and contains a stamped metal helix separator with several compartments which allows the gas to expand and further decrease both its pressure and temperature. Finally, it deflects the gases as they exit the muzzle, muffling the exit report. As bullet leaves the muzzle at subsonic velocity it doesn't generate a sonic shock wave in flight like other guns which further decreases the sound produced. As a result of reducing the barrel’s length and the venting propellant gases in the first segment of the suppressor, the bullet’s muzzle velocity drops in the range of 16-26% (depending on the ammunition used) while maintaining the weapon’s reliability. The weapon was intended to be used with either subsonic ammunition or standard supersonic ammunition while maintaining the same level of sound suppression.

In 1974, Heckler & Koch started to work on a suppressed version of the MP5. Through the years, they developed variants of them like the MP5SD1/D4 (both featuring a receiver end rather than having a buttstock), the MP5SD2 (which is the actual model in-game)/D5 (they included a fixed buttstock), and others.

Source: roblox-phantom-forces.fandom.c…

Imagine source: hk-usa.com/hk-models/mp5sd/