You've done beautiful work.
The MP5 was introduced in 1966...
From H&K's website:HISTORY
"...In 1961, Heckler & Koch developed the 7.62×51mm HK21 general-purpose machine gun based on the G3 battle rifle.
In 1966, Heckler & Koch introduced the HK54 machine pistol, which eventually launched in 1969 as the MP5 machine pistol Two years later, ...)Information
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