The Heckler & Koch MP5 (German : Maschinenpistole 5) is a submachine gun developed in the 1960s by German firearms manufacturer Heckler & Koch. It uses a similar modular design to the Heckler & Koch G3, and has over 100 variants and clones, [14] including selective fire, semi-automatic, suppressed, compact, pistol-classed, and even marksman variants. [15] The MP5 is one of the most widely used submachine guns in the world, having been adopted by over forty nations and numerous militaries, police forces, intelligence agencies, security organizations, paramilitaries, and non-state actors. [16]
In 1999, Heckler & Koch developed the UMP, which was intended as the MP5's successor. [17] However, despite its higher cost, the MP5 remained the more successful of the two options, as its roller-delayed action was considered better at "reduc[ing] recoil ... making it easier to stay on target" than the UMP's straight blowback action. [18]
Heckler & Koch, encouraged by the success of the G3 battle rifle, developed a family of small arms consisting of four types of firearms all based on a common G3 design layout and operating principle. The first type was chambered for 7.62×51mm NATO, the second for the 7.62×39mm M43, the third for 5.56×45mm NATO, and the fourth for the 9×19mm Parabellum. The MP5 was created for the fourth type, and was initially known as the HK54; under the HK naming system, this categorizes it as a selective fire carbine chambered in a handgun cartridge. [19]
Work on the MP5 began in 1964, and in 1966 it was adopted by the German Federal Police, Federal Border Guard, and Bundeswehr special forces, initially as the MP64, before being redesignated as the MP5. [19] The MP5A1 was introduced in the late 1960s and was the first model to feature the front ring sight and "Slimline" handguard. In 1970, the MP5 and MP5A1 were superseded by the MP5A2 and MP5A3, improvements to the MP5A1 with a fixed stock and retracting stock respectively. In 1974, the MP5SD, an integrally-suppressed variant, was introduced, and in 1976, the MP5K, a redesigned compact variant, was developed per a request for a variant that suited close-quarters combat in South America. In 1977, the original straight magazines were replaced by curved steel magazines. In 1978, the "Tropical" handguard was introduced for the MP5.
In 1980, the MP5 achieved an iconic status during the Iranian Embassy siege, when the British Army's elite Special Air Service broke the siege by launching a raid on the embassy to rescue the hostages held inside; photographs and footage of SAS operatives entering the embassy carrying MP5s with top-mounted flashlights were widely disseminated in newspapers and on television, making the MP5 widely recognizable and associated with elite counterterrorist units. [20] The MP5 has since become a mainstay in militaries, special forces, and police tactical units across the world, but has gradually been replaced since the late 1990s by rifles, carbines, and personal defense weapons due to changes in armament trends, including growing access to body armor that can stop handgun cartridges. [21]
The MP5 is manufactured under license in several nations including Greece (formerly at Hellenic Arms Industry, currently at Hellenic Defence Systems), Iran (Defense Industries Organization), Mexico (SEDENA), Pakistan (Pakistan Ordnance Factories), Saudi Arabia, Sudan (Military Industry Corporation), Turkey (MKEK), and the United Kingdom (formerly at Royal Ordnance, later moved to Heckler & Koch Great Britain). [22]
The primary version of the MP5 family is the MP5A2, which is a lightweight, air-cooled, selective fire delayed blowback operated 9×19mm Parabellum weapon with a roller-delayed bolt. It fires from a closed bolt (bolt forward) position. [23]
The fixed, free-floating, cold hammer-forged barrel has six right-hand grooves with a 1 in 250 mm (1:10 in) rifling twist rate and is pressed and pinned into the receiver. [24]
The first MP5 models used a double-column straight box magazine, but since 1977, slightly curved, steel magazines have been used with a 15-round capacity (weighing 0.12 kg) or a 30-round capacity (0.17 kg empty). [24]
The adjustable iron sights (closed type) consist of a rotating rear diopter drum and a front post installed in a hooded ring. The rear sight is mechanically adjustable for both windage and elevation with the use of a special tool, being adjusted at the factory for firing at 25 metres (27 yd) with standard 8 grams (123 gr) FMJ 9×19mm NATO ammunition. The rear sight drum provides four apertures of varying diameters used to adjust the diopter system, according to the user's preference and tactical situation. [25] Changing between apertures does not change the point of impact down range.
The MP5 has a hammer firing mechanism. The trigger group is housed inside an interchangeable polymer trigger module (with an integrated pistol grip) and equipped with a three-position fire mode selector that serves as the manual safety toggle. The "S" or Sicher position in white denotes weapon safe, "E" or Einzelfeuer in red represents single fire, and "F" or Feuerstoß (also marked in red) designates continuous fire. The SEF symbols appear on both sides of the plastic trigger group. The selector lever is actuated with the thumb of the shooting hand and is located only on the left side of the original SEF trigger group or on both sides of the ambidextrous trigger groups. The safety/selector is rotated into the various firing settings or safety position by depressing the tail end of the lever. Tactile clicks (stops) are present at each position to provide a positive stop and prevent inadvertent rotation. The "safe" setting disables the trigger by blocking the hammer release with a solid section of the safety axle located inside the trigger housing. [24]
The non-reciprocating cocking handle is located above the handguard and protrudes from the cocking handle tube at approximately a 45° angle. This rigid control is attached to a tubular piece within the cocking lever housing called the cocking lever support, which in turn makes contact with the forward extension of the bolt group. It is not however connected to the bolt carrier and therefore cannot be used as a forward assist to fully seat the bolt group. The cocking handle is held in a forward position by a spring detent located in the front end of the cocking lever support which engages in the cocking lever housing. The lever is locked back by pulling it fully to the rear and rotating it slightly clockwise where it can be hooked into an indent in the cocking lever tube. [24]
The bolt rigidly engages the barrel extension—a cylindrical component welded to the receiver into which the barrel is pinned. The delay mechanism is of the same design as that used in the G3 rifle. The two-part bolt consists of a bolt head with rollers and a bolt carrier. The heavier bolt carrier lies up against the bolt head when the weapon is ready to fire and inclined planes on the front locking piece lie between the rollers and force them out into recesses in the barrel extension. [26]
When fired, expanding propellant gases produced from the burning powder in the cartridge exert rearward pressure on the bolt head transferred through the base of the cartridge case as it is propelled out of the chamber. A portion of this force is transmitted through the rollers projecting from the bolt head, which are cammed inward against the inclined flanks of the locking recesses in the barrel extension and to the angled shoulders of the locking piece. The selected angles of the recesses and the incline on the locking piece produce a velocity ratio of about 4:1 between the bolt carrier and the bolt head. This results in a calculated delay, allowing the projectile to exit the barrel and gas pressure to drop to a safe level before the case is extracted from the chamber. [26]
The delay results from the amount of time it takes for enough recoil energy to be transferred through to the bolt carrier in a sufficient quantity for it to be driven to the rear against the force of inertia of the bolt carrier and the forward pressure exerted against the bolt by the recoil spring. As the rollers are forced inward they displace the locking piece and propel the bolt carrier to the rear. The bolt carrier's rearward velocity is four times that of the bolt head since the cartridge remains in the chamber for a short period of time during the initial recoil impulse. After the bolt carrier has travelled rearward 4 mm, the locking piece is withdrawn fully from the bolt head and the rollers are compressed into the bolt head. Only once the locking rollers are fully cammed into the bolt head can the entire bolt group continue its rearward movement in the receiver, breaking the seal in the chamber and continuing the feeding cycle. [26]
Since the 9×19mm Parabellum cartridge is relatively low powered, the bolt does not have an anti-bounce device like the G3, but instead the bolt carrier contains 32.5 g (1.15 oz) of tungsten granules that prevent the bolt group from bouncing back after impacting the barrel extension. The weapon has a fluted chamber that enhances extraction reliability by bleeding gases backwards into the shallow flutes running along the length of the chamber to prevent the cartridge case from expanding and sticking to the chamber walls (since the bolt is opened under relatively high barrel pressure). A spring extractor is installed inside the bolt head and holds the case securely until it strikes the ejector arm and is thrown out of the ejection port to the right of the receiver. The lever-type ejector is located inside the trigger housing (activated by the movement of the recoiling bolt). [26]
In the early 1970s, HK introduced a conversion kit for the MP5 that enables it to use rimfire ammunition (.22 LR). This unit consists of a barrel insert, a bolt group and two 20-round magazines. This modification reduces the cyclic rate to 650 rounds per minute. It was sold mostly to law enforcement agencies as a way to train recruits on handling the MP5. It used ammunition that was cheaper and had a lower recoil than 9×19mm Parabellum. This reduced training costs and built up skill and confidence in the operators before transitioning them to the full-bore model.
Threading is provided at the muzzle to work with certain muzzle devices made by Heckler & Koch, including: a slotted flash suppressor, blank firing attachment (marked with a red-painted band denoting use with blank ammunition only), an adapter for launching rifle grenades (for use with rifle-style grenades with an inside diameter of 22 mm using a special grenade launching cartridge) and a cup-type attachment used to launch tear gas grenades. An optional three-lugged barrel is also available for mounting a quick-detachable suppressor.
The receiver housing has a proprietary claw-rail mounting system that permits the attachment of a standard Heckler & Koch quick-detachable scope mount (also used with the G3, HK33, and G3SG/1). It can be used to mount daytime optical sights (telescopic 4×24), night sights, reflex sights, and laser sights. The mount features two spring-actuated bolts, positioned along the base of the mount, which exert pressure on the receiver to hold the mount in the same position at all times assuring zero retention. All versions of the quick-detachable scope mount provide a sighting tunnel through the mount so that the shooter can continue to use the fixed iron sights with the scope mount attached to the top of the receiver.
A Picatinny rail adapter can be placed on top that locks into the claw rails. This allows the mounting of STANAG scopes and has a lower profile than the claw-rail system.
Standard MP5 variants have the option of two handguard variants: "Slimline", the original slim checkered metal handguard; and "Tropical", a wider and smoother polymer handguard introduced in 1978.
The MP5SD, MP5K, and SP89 have unique handguards owing to their design differences; the MP5SD handguard is similar to Slimline but larger to fit the integrated suppressor, the MP5K handguard has a built-in foregrip and handstop, and the SP89 handguard is similar to the MP5K's but extended and without the foregrip.
Aftermarket handguards also exist, including newer vented handguards based on the Tropical handguard, "dedicated forend" handguards featuring a built-in underbarrel tactical light, and rail integration system-equipped handguards to fit attachments. [27]
The stockless MP5A1 has a buttcap with a sling mount for concealed carry; the MP5K series was a further development of this idea. [28] The MP5A2 has a fixed buttstock (made of a synthetic polymer), whereas the compact MP5A3 has a retractable metal stock.
The MP5A4 (fixed stock) and MP5A5 (sliding stock) models, which were introduced in 1974, are available with four-position trigger groups. The pistol grips are straight, lacking the contoured grip and thumb groove of the MP5A1, MP5A2, and MP5A3. The selector lever stops are marked with bullet pictograms rather than letters or numbers (each symbol represents the number of bullets that will be fired when the trigger is pulled and held rearward with a full magazine inserted in the weapon) and are fully ambidextrous (the selector lever is present on each side of the trigger housing). The additional setting of the fire selector, one place before the fully automatic setting, enables a two or three-shot burst firing mode.
Heckler & Koch offers dedicated training variants of these weapons, designated MP5A4PT and MP5A5PT (PT—Plastic Training), modified to fire a plastic 9×19mm PT training cartridge produced by Dynamit Nobel. These weapons operate like the standard MP5 but have a floating chamber and both rollers have been omitted from the bolt to function properly when firing the lighter plastic projectiles. To help identify these weapons blue dots were painted on their cocking handles and additional lettering provided. The PT variant can be configured with various buttstocks and trigger groups and was developed for the West German Police and Border Guard. [29]
A variant with the last trigger group designated the MP5-N (N—Navy) was developed in 1986 for the United States Navy. This model has a collapsible stock, a tritium-illuminated front sight post and a 225 mm (8.9 in) threaded barrel for use with a stainless steel sound suppressor made by Knight's Armament Company together with quieter subsonic ammunition. It had ambidextrous controls, a straight pistol grip, pictogram markings, and originally had a four-position selector (Safe, Semi-Auto, 3-Round Burst, Full Auto). This was replaced with a similar three-position ambidextrous selector after an improperly-reassembled trigger group spontaneously fired during an exercise. The "Navy"-style ambidextrous trigger group later became standard, replacing the classic "SEF" trigger group.
In late 2013, Heckler & Koch unveiled the MLI (Mid Life Improvement) version of the MP5. It is fitted with a tri-rail foregrip, a quick-release-optic mount, an MP5F stock standard, and comes in with the new RAL8000 (Yellow-Brown) color scheme.
Type | Positions | Settings | Location |
---|---|---|---|
SEF | 3-position | Safe (Sicher), semi-auto (Einzelfeuer), fully automatic (Feuerstoß) | Left-side |
SE | 2-position | Safe & semi-auto (Fire) | Ambidextrous |
Navy | 4-position | Safe, semi-auto, 2- or 3-round burst, fully automatic | Ambidextrous |
Navy | 3-position | Safe, semi-auto, fully automatic | Ambidextrous |
Setting | Marking system | ||
---|---|---|---|
Number | Letter | Pictogram | |
Safe | Marked by a white numeral "0" | Marked by a white letter "S" | Marked by a white pictogram of a bullet symbol inside a closed rectangle with an "X" through it. |
Semi-automatic fire | Marked by a red numeral "1" | Marked by a red letter "E" | Marked by a red pictogram of a bullet symbol inside a closed rectangle. |
Burst fire | Marked by a red numeral "2" or "3" | Marked by a red numeral "2" or "3" | Marked by a red pictogram of 2 or 3 bullets in a line inside a closed rectangle. |
Fully automatic fire | Marked by a red numeral "30" | Marked by a red letter "F" | Marked by a red pictogram of 7 bullets in a line inside a rectangle with an open end facing the muzzle. |
The MP5SD was created in 1974, Heckler & Koch initiated design work on a sound-suppressed variant of the MP5, designated the MP5SD (SD—Schalldämpfer, German for "sound suppressor"), [32] which features an integral but detachable aluminium sound suppressor and a lightweight bolt. The weapon's 146 mm (5.7 in) barrel has 30 2.5 mm (0.1 in) ports drilled forward of the chamber through which escaping gases are diverted to the surrounding sealed tubular casing that is screwed onto threading on the barrel's external surface just prior to the ported segment. 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 down the acceleration of the projectile. The second, decompression stage occupies the remaining length of the suppressor tube and contains a stamped metal helix separator with several compartments which increase the gas volume and decrease its temperature, deflecting the gases as they exit the muzzle, so muffling the exit report. The bullet leaves the muzzle at subsonic velocity, so it does not generate a sonic shock wave in flight. As a result of reducing the barrel's length and venting propellant gases into the suppressor, the bullet's muzzle velocity was lowered anywhere from 16% to 26% (depending on the ammunition used) while maintaining the weapon's automation and reliability. The weapon was designed to be used with standard supersonic ammunition with the suppressor on at all times. [24] The cyclic rate of fire of the MP5SD is around 700 rounds per minute. [33]
The MP5SD is produced exclusively by Heckler & Koch in several versions: the MP5SD1 and MP5SD4 (both have a receiver end cap instead of a buttstock), MP5SD2 and MP5SD5 (equipped with a fixed synthetic buttstock) and the MP5SD3 and MP5SD6 (fitted with a collapsible metal stock). The MP5SD1, MP5SD2 and MP5SD3 use a standard 'SEF' trigger group (from the MP5A2 and MP5A3), while the MP5SD4, MP5SD5, and MP5SD6 use the 'Navy' trigger group—a trigger module with a mechanically limited 3-round burst mode and ambidextrous selector controls (from the MP5A4 and MP5A5). A suppressed version was produced for the U.S. Navy—designated the MP5SD-N, which is a version of the MP5SD3 with a retractable metal stock, front sight post with tritium-illuminated dot and a stainless steel suppressor. This model has a modified cocking handle support to account for the slightly larger outside diameter of the suppressor. The design of the suppressor allows the weapon to be fired with water inside, should water enter the device during operation in or near water. [34]
In 1976, a shortened version of the MP5A2 was introduced; the MP5K (K from the German word Kurz = "short") was designed for close quarters battle use by clandestine operations and special services. The MP5K does not have a shoulder stock (the receiver end was covered with a flat end cap, featuring a buffer on the inside and a sling loop on the outside), and the bolt and receiver were shortened at the rear. There are no MP5KA2 or MP5KA3 models because it does not come with a fixed or retractable stock. The resultant lighter bolt led to a higher rate of fire than the standard MP5 at around 900 rounds per minute. It has a shortened 4.5 in (114 mm) barrel, a shorter trigger group frame, the charging handle and its cover were shortened and a vertical foregrip was used to replace the standard handguard. The barrel ends at the base of the front sight, which prevents the use of any sort of muzzle device. [25]
The MP5K is produced (by Heckler & Koch and under license in Iran and Turkey) in four different versions: the MP5K, MP5KA4, MP5KA1, MP5KA5, where the first two variants have adjustable, open-type iron sights (with a notched rotary drum), and the two remaining variants – fixed open sights; however, the front sight post was changed and a notch was cut into the receiver top cover. The MP5K retained the capability to use optical sights through the use of an adapter. [25]
A civilian semiautomatic derivative of the MP5K known as the SP89 was produced that had a foregrip with a muzzle guard in place of the vertical grip. [36]
In 1991, a further variant of the MP5K was developed, designated the MP5K-PDW (PDW—Personal Defense Weapon) that retained the compact dimensions of the MP5K but restored the fire handling characteristics of the full-size MP5A2. The MP5K-PDW uses a side-folding synthetic shoulder stock (made by the U.S. company Choate Machine and Tool), a "Navy" trigger group, a front sight post with a built-in tritium insert and a slightly lengthened threaded, three-lug barrel (analogous to the MP5-N). The stock can be removed and replaced with a receiver endplate; a rotary drum with apertures from the MP5A2 can also be used. [35]
In 1992, Heckler & Koch introduced the MP5/10 (chambered in 10mm Auto) and MP5/40 (chambered for the .40 S&W cartridge), which are based on the MP5A4 and MP5A5. These weapons were assembled in fixed and retractable stock configurations (without a separate designation) and are fed from translucent 30-round polymer box magazines. These weapons include a bolt hold-open device, which captures the bolt group in its rear position after expending the last cartridge from the magazine. The bolt is then released by pressing a lever positioned on the left side of the receiver. Both weapons use a barrel with 6 right-hand grooves and a 380 mm (1:15 in) twist rate, and like the MP5-N, both have a 3-lugged muzzle device and a tritium-illuminated front sight aiming dot. [40]
Problems with the MP5/10 and MP5/40 led to their discontinuation in 2000, although Heckler & Koch continues to provide support and spare parts. [40]
A rechambering kit for 6.5×25mm CBJ which only required a barrel change was proposed. [45]
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