A 40mm Pistol

Swords were replaced by pistols as symbols of military leadership. Pistols are rarely used in combat because they have limited utility. A far more effective compact weapon is a 40mm pistol. These simple, lightweight, single-shot, multi-role weapons are now for sale on the civilian market for just $60 each. This is just a shorter version of the M79 that was very popular during the Vietnam war. The US military's current M203 is also made of aluminum, so there is little difference with the Airsoft "game" pistol pictured, if any. The kick is big, so two hands should used. Since the barrel is half as long, velocity/range is cut in half but still far more than a pistol, and recoil is less than the M203 since a shorter barrel allows more gas energy to escape.

For close encounters, a 40mm buckshot round is extremely effective and far more likely to hit a target with the first shot. In urban combat, this pistol could fire explosive grenades down a hallway or through a window. They can fire HEDP rounds to blast open doors or cars, or to punch a hole in a light armored vehicle. 

The variety of 40mm rounds allows them to fire signal or illumination flares. In non-combat roles, they can fire a beanbag round to knock someone down, or tear gas to disperse crowds. While they are larger than military pistols, they are lighter, more intimidating, and far more useful for a variety of roles.

From Wikipedia:

According to the U.S. ARMY FIELD MANUAL FM 3-22.31 40-MM GRENADE LAUNCHER, M203,[6] there are 8 different rounds for the M203:

  1. (M433) High-Explosive. Dual Purpose Round. The HEDP round has an olive drab aluminum skirt with a steel cup attached, white markings, and a gold ogive (head of the round). It penetrates at least 5 cm (2 inches) when fired straight at steel armor at 150 meters or less, or, at a point target, it arms between 14 and 27 meters, causes casualties within a 130-meter radius, and has a kill radius of 5 meters.[7]
  2. (M406) High-Explosive Round. The HE round has an olive drab aluminum skirt with a steel projectile attached, gold markings, and a yellow ogive. It arms between 14 and 27 meters, produces a ground burst that causes casualties within a 130-meter radius, and has a kill radius of 5 meters.[8]
  3. (M583A1) Star Parachute Round. This round is white impact or bar alloy aluminum, with black markings. It is used for illumination and signals and is lighter and more accurate than comparable handheld signal rounds. The parachute attached to the round deploys upon ejection to lower the candle at 7 feet per second. The candle burns for about 40 seconds. A raised letter on the top of the round denotes the color of the parachute.[8]
  4. (M585) White Star Cluster Round. This round is white impact or bar aluminum alloy, with black markings. The attached plastic ogive has five raised dots for night identification. The round is used for illumination or signals. It is lighter and more accurate than comparable handheld signal rounds. The individual stars burn for about 7 seconds during free fall.[9]
  5. (M713) Ground Marker Round. This round is light green impact aluminum with black markings. It is used for aerial identification and for marking the location of soldiers on the ground. It arms between 15 and 45 meters. If a fuse fails to function on impact, the output mixture provided in the front end of the delay casing backs up the impact feature. The color of the ogive indicates the color of the smoke.[9]
  6. (M781) Practice Round. Used for practice, this round is blue zinc or aluminum, with white markings. It produces a yellow or orange signature on impact, arms between 14 and 27 meters, and has a danger radius of 20 meters.[10]
  7. (M651) CS Round. This round is gray aluminum with a green casing and black markings. Though it is a multipurpose round, it is most effective for riot control and in Urban Operations. It arms between 10 and 30 meters and produces a white cloud of CS gas on impact.[11]
  8. (M576)[12] Buckshot Round. This round is olive drab with black markings. Though it is a multipurpose round, it is most effective in thick vegetated areas or for room clearing. Inside, it has 20 metal pellets, each weighing 24 grains, with a muzzle velocity of 269 meters per second. The round has no mechanical-type fuse.[13]

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