This submachine gun is one of the most well known bullpop designed rifles. A very special design aspect is the magazine, it is located on top of the rifle, not below. See the videos for details how this works. The cartridge holds 50 rounds. Designed for a shooting distance of 200m, total range is 1800meters though. Differences between the versions: FN P90: original version FN P90 TR: similar to P90 but has a triple rail interface on top of the rifle. This allows to use standard attachments on the submachine gun FN PS90: civilian version: it does not contain the full auto fire mode

The Heckler & Koch HK 53 A3 is a shorter variant of the HK 33 assault rifle.In 3D shooter games it is usually displayed as a submachine gun, though it should maybe be an assault rifle, s it's based on an assault rifle. This needs to be verified though.http://www.hkpro.com/hk53.htm

PDR stands for "Personal Defense Rifle". It is a bullpop design to make the submachine gun shorter (the magazine is located behind the grib).

Manufacturer: Heckler & KochProduct page:http://www.hkd-usa.com/HKWebText/detailProd/1926/81/4/20

The MP5 has a ton of variants and each can be modified. In games usually you find a submachine gun close to the MP5 A4 or MP5 A2, if a game just says "MP5" we reference to the MP5 A4 then. The variants use the calibers 9x19mm, 10mm Auto (for MP5/10) and .40 Smith & wesson for the MP5/40 gun.

This version of the MP5 has special parts to be used at the water front. This means especially it has a better resitance against salt water and corrosion. Afaik this is not the only difference?

The MP5 SD is very silent. If you watch the videos, you see, that you only hear the sound the mechanic of the weapon does, but not the shooting itself. This is only possible, because the silencer is made as a part of the weapon, not as an attachment.

The MP5k is the short version of hte well Heckler & Koch MP5. MP5k stands for "Maschinenpistole 5 kurz" (means: "submachine gun 5 short").One of the specialities of the MP5k is, that there exists a very special version for german special forces: the MP5k sits in a suitcase and can be fired with a hidden trigger in the handle. This sounds like a cheap B-movie (or a old James Bond movie), but it really exists.

One of the newest submachine guns, manufactured since 2004. Links: http://world.guns.ru/smg/smg61-e.htm

The TDI Vector series is a family of .45 ACP submachine guns developed by Transformational Defense Industries. They utilize asymmetrical recoil and in-line design to reduce recoil and muzzle climb. This operating system is called the Kriss Super V.

Pretty old rifle, was developed in the 1980s... and looks even older .

The UZI submachine gun is one of the standard weapons fo Israel's security forces. IMI is the israelic manufacturer.