{{Weapon Infobox
| image=FileMp5w.jpg|250px
| name=MP5
| affiliation=*Hazardous Environment Combat Unit
*Black Mesa
*Military Police
*Black Ops
| manufacturer=WikipediaHeckler & Koch|Heckler & Koch
| model=*MP5 (original) 
*M4 (HD pack)
| type=WikipediaSubmachine gun|Submachine gun
| damage=5 points/bullet (8 points in some games such as ''Half-Life Source''), 100 points/grenade if direct hit
| magazine=50 rounds 
| maxammo=*250 rounds
*10 grenades
| fire=Automatic
| ammotype=*Wikipedia9×19mm Parabellum|9×19mm Parabellum
*20mm grenades
| operation=Roller-delayed blowback, closed bolt
| recoil=*Low (GoldSrc)
*Medium (Half-Life Source|HLS)
| rate of fire=*MP5 600 RPM 
*Grenade Launcher 60 RPM
| accuracy=Moderate
| range=Medium
| usedby=*Gordon Freeman
*Adrian Shephard
*Barney Calhoun
*Gina Cross
*Colette Green
*HECU Marines
*Male Black Ops
| counterpart=
| counterwep=
| entity=*weapon_mp5
*weapon_9mmAR (GoldSrc only)
| designer=Stephen Bahl (HD version)http// Stephen Bahl as quoted on ''Marc Laidlaw Vault'' on the Forums
The Heckler & Koch '''MP5''', simply known as the '''Submachine Gun''' or '''SMG''', is a weapon featured in ''Half-Life'' and its expansions. The primary weapon used by the Hazardous Environment Combat Unit|HECU, it is an automatic weapon with a high rate of fire. It is also equipped with the 'Shorty' version of the M203 grenade launcher that boosts its effectiveness.

FileHECU beret model.jpg|thumb|150px|left|The original HECU beret model holding an MP5.

*The SMG's bullets will instantly hit a target as soon as the gun is fired. It uses the same ammunition as the Glock 17.

*The attached grenade launcher fires powerful explosives that will automatically explode when hitting the ground. It does not need to be reloaded, so the player can fire as many grenades as they want until they run out of ammo for it.

*Both the MP5 and the Glock 17 use Wikipedia9x19MM Parabellum|9x19MM Parabellum and share the same ammunition reserve, making the MP5 and the Glock 17 very easy to find ammunition for.

*This weapon is first obtained at the start of the ''Half-Life'' chapter ''Half-Life storyline#"We've Got Hostiles"|"We've Got Hostiles"''. It can be found next to a dead HECU soldier in the first room that has HECU Sentry Gun|sentry guns. After that, it can be found in areas controlled by the HECU and picked up from dead HECU soldiers.

*In ''Half-Life Opposing Force|Opposing Force'', the MP5 is first obtained in the Chapter ''We Are Pulling Out'', it found next to a dead HECU soldier who was fighting the Vortigaunts.

*In ''Half-LifeBlue Shift|Blue Shift'', The MP5 is first obtained by killing a HECU soldier who was killing Harold, in the chapter ''Captive Freight''.

*When a player picks up an SMG for the first time, it will have 25 rounds in its magazine. The player must reload the gun to get 50 rounds in the magazine. However, in some related games such as ''Half-Life Day One'' and ''Half-Life Opposing Force'', the MP5 already holds 50 rounds when picked up.

*When the ''Half-Life High Definition Pack'' is enabled, the MP5 becomes an M4 Carbine Assault Rifle.

FileBlackop firing.jpg|Male Black Op firing at Shock Troopers with an MP5.|thumb|200px|left

*The MP5's accuracy is suitable for short to medium combat ranges, but has poor accuracy at longer ranges, so it is recommended to use five round bursts for long range. However, since the recoil was increased in ''Half-Life Source'', it no longer effective to against a target at long range.

*The player should be sure not to use the MP5's bullets against large groups of enemies for the MP5's bullets do only 5 points of damage. Save the bullets and fire the MP5's grenade launcher instead.

*Groups of weak enemies, such as Standard Headcrab|Headcrabs or Houndeyes, can easily be killed with the MP5.

*The MP5 is effective on small groups of Vortigaunts and Hazardous Environment Combat Unit|HECU Marines. With Vortigaunts, one should remember to move often to avoid being hit by the Vortigaunts electric bolts. With HECU soldiers, one should stay out of their effective range or make use of cover, since they have the same SMGs and slightly better accuracy.

*The Alien Controller is easy to kill with the SMG. Since its bullets hit instantly, the player can attack the Controller and avoid its plasma balls with ease.

*The SMG's accuracy is not affected by crouching, although it decrease little recoil in the Source version.

*In multiplayer, the MP5 is more accurate, though the opposite was true in early versions of Half-Life.

===Grenade launcher===
FileWe Are Pulling Out4.jpg|HECU soldier threatening a scientist with his MP5.|thumb|200px|right

*The grenade launcher should be used to clear out large groups of enemies at once. One grenade can kill up to five HECU soldiers with ease if it lands in the center of the group.

*The grenade launcher is also effective against enemies that have a lot of health, such as the Alien Grunt. One grenade can usually kill it in one shot. If not, it only takes a few shots from the SMG to finish it off.

*Using the grenade launcher against weak enemies, such as Headcrabs, is obviously effective but is a waste of ammunition (unless it a group of Headcrabs). Melee attacks or normal bullets from any weapon are more advised.

*The grenade launcher is one of the few weapons that can damage a Gargantua, so one should stock up on its ammo when wanting to kill a Gargantua manually.

*If the grenade launcher is used at long range, intelligent enemies can usually run away from it before it explodes. Therefore, getting closer to the intended victims before firing is advised, as it prevents them from running away. However, being too close will affect the player's health, as with all explosive weapons.

==Behind the scenes==
*The MP5 was originally to be an M4 Carbine Assault Rifle. It was switched to the MP5 early in development, though the ''Half-Life High Definition Pack'' turned it back into an M4.

*The original MP5 had a different firing sound than the retail one. In addition, it could carry more than 10 grenades.

*The retail viewmodel and the early worldmodel is an MP5SD, while the retail worldmodel is a regular MP5.

*In the ''Half-Life High Definition Pack'', the M4 still uses the same ammunition reserve as the Glock 17|pistol. 

*The grenade launcher in ''Deathmatch Classic'' uses a reskinned MP5 grenade model.

*Early textures for the MP5 can be found in the ''Half-Life'' SDK files.

*The MP5 originally used 30-round magazines. It was changed to 50 in the final game (oddly enough, in real life, the MP5s do not have 50 round magazines).

*The ''Half-Life Day One'' viewmodel is different from the retail model, however this can be only seen through a model viewer. The left arm is bugged and its only polygon is always attached to the magazine, and there's chrome on left arm instead of red stripes.

*In the http// Doom mod Massmouth, the MP5 acts as a weapon, replacing the chaingun, delivering rapid fire. It's sprites are simply 2D renders of the HL MP5, with the fingers re-shaped and re-colored green.

*The MP5's replacement model in the HD pack is commonly referred to as an "M4", but is actually a http// Colt Model 727, designated as such by the lack of detachable carry handle.

*In Half-LifeSource, the grenade launcher is not fixed to the gun.

*If the MP5 is replaced by the M4, the M4 will still share the same stats as the MP5 (in terms of accuracy, power, clip capacity, and ammunition).

*The damage in ''Half-Life Source'' is increased to 8 per bullet instead of 5 (as same damage as Glock 17). However, in compensate this, the recoil is increased so it no longer effective at long range even if one fires in short bursts, and if one fires the MP5 in full auto, the screen will til up and down.


FileHECU beta M4.jpg|Early HECU grunts with M4s and player, with an early viewmodel.
FileHECU beta M4 aimed.jpg|Ditto.
FileHECU beta M4b.jpg|Ditto.
FileHECU beta M4a.jpg|Early HECU grunts with M4s and an early pistol viewmodel.
FileOld MP5 shooting glass.jpg|Early MP5 shooting glass in an early Sector C.
FileHECU beta MP5.jpg|Early HECU grunts with early MP5s.
FileMp5 hud.png|HUD icon.
FileMp5hd hud.png|Half-Life High Definition Pack|HD HUD icon for the M4.
FileMP5_beta_vmodel.png|Early viewmodel.
FileMp5 1.png|Viewmodel.
FileM4w.png|HD worldmodel, an M4.
File9mmar hd.png|HD viewmodel.
FileArgrenade 1.png|Grenades model.
FileMp5mag 1.png|A spare MP5 magazine, which holds 50 rounds of 9mm ammo.
Fileargrenade hd.png|HD grenades model.
Filemp5mag hd.png|HD spare magazine. It is a WikipediaSTANAG magazine|STANAG-standard 5.56x45mm magazine.
Filechainammo 1.png|A large box of 9mm ammo, holding 200 rounds. It is never seen in ''Half-Life'' but appears in many Mods|mods and fan-made maps.

==List of appearances==
{{Imagecat|SMG (HL1) images}}

*''Half-Life Day One'' {{1st}}
*''Half-Life Uplink'' {{Nc}}
*''Half-Life Opposing Force''
*''Half-Life Blue Shift''
*''Half-Life Decay''
*''Half-Life 2 Raising the Bar''


==External links==
*{{Wikipedia|url=Heckler_&_Koch_MP5|text=Heckler & Koch MP5}}

{{Black Ops}}
{{Black Mesa}}

plMP5 (HL)
CategorySubmachine guns
CategoryHECU weapons
CategoryAutomatic weapons
CategoryBlack Ops weapons
CategoryBlack Mesa weapons
CategoryHeckler & Koch weapons