stowed. The weapon has a synthetic pistol grip, a lightweight telescopic metal stock with a rubber shoulder pad and sling swivels for use with a sling. The grenade launcher is typically carried in a thigh holster. Variants The HK69A1 is also available in a 40 mm police variant, called the MZP 1 (short for Mehrzweckpistole 1 > "Multipurpose Pistol #1"). It is equipped only with a flip sight with 50, 100 and 150 m range adjustments; the leaf sight was removed. The MZP-1 weighs , the remaining parameters are identical to those of the HK69A1. It is used as a tear gas grenade launcher. Dual use as signal-/flare launcher is possible but no longer common (German police). A version fitted with a 37mm barrel (rifled rather than the typical smoothbore used with 37mm munitions) was adopted by Britain as the L104A1. The bore was rifled in order to increase the accuracy of the L21A1 plastic baton round, thus reducing the likelihood of unintentionally hitting a vulnerable part of the body and causing a fatal injury. Based on the HK69A1 is the HK79 underslung grenade launcher, designed to be mounted under the barrel of the G3 and G41 series of assault rifles (with the exception of the short, carbine versions). When attached, the HK79 does not affect the accuracy of the rifle, since the barrel is free to oscillate. Handling and operating functions of the rifle are not affected by the presence of the launcher. The weapon is used by the armed forces of Nicaragua, Norway and Panama. The HK79 is a single-fire, manually operated weapon, whose breech-loaded steel barrel is tilted downward for loading and unloading (compared to the HK69A1, which hinges upward). The barrel in the closed position is locked into battery with a rear-mounted latch. The weapon lacks an extractor; cuts made into the barrel’s base assist the user in manually removing spent cartridges. The HK79 is fitted with an internal, single-action firing mechanism that has a charging mechanism located at the rear of the frame (the mechanism is cocked manually after loading the weapon) and a trigger mechanism with a button-type trigger located on the left-hand side of the handguard. Safe operation is ensured by means of a cross-bolt manual safety catch (installed in the frame, forward of the cocking mechanism). The safety mechanism’s “safe” and “ready” positions are marked with red and white rings respectively; the