However, in some related games such as Half-Life: Day One and Half-Life: Opposing Force, the Submachine Gun already holds 50 rounds when picked up. The player must reload the gun to get 50 rounds in the magazine. When a player picks up an SMG for the first time, it will have 25 rounds in its magazine.After that, it can be found in areas controlled by the HECU and picked up from dead HECU Marines. It can be found next to a dead HECU Marine in the first room that has Sentry Guns. This weapon is first obtained at the start of the Half-Life chapter 'We've Got Hostiles'.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. The attached grenade launcher fires powerful explosives that will automatically explode when hitting the ground.Both the Submachine Gun and the 9mm Pistol use 9×19mm Parabellum and share the same ammunition reserve, making the Submachine Gun and the 9mm Pistol very easy to find ammunition for.