sentences:  The launcher’s history dates back to the late 1960s, when development began of a weapon intended to be fitted (using a special mount) under the barrel of the 7.62×51mm NATO G3A3 rifle.In 1972 the prototype was unveiled of what would ultimately become the Granatpistole HK69.After being evaluated, the decision was made to develop an autonomous stand-alone version of the grenade launcher, which was created in 1979 and designated the HK69A1.