The HK91 is a semi-automatic, civillian-legal co-variant rifle designed off the most recognized combat rifle of the 20th & 21st century, the HKG3A1. Both the HK91A1 & HKG3A1 were designed originally by CETME in 1946. The company Heckler And Koch asked permission from both the President of CETME & the CEO of CETME in 1946 for the design of the G3 & 91 rifles for the German Government & the German Military. Then from 1946-1956,the HKG3A1 & HK91A1 were tested by the Germans for 10 years, 2 months, & 4 weeks (which is only 28 days, by the way. So, no, it is not a whole month, or counted as one in the 4-week mark). When it was approved by both NATO & the Germans for service, they were regarded as both of the best rifles to ever grace the battlefield. Soldiers from over 138 countries have used, & actually for a short amount of time, the U.S.S.R. (United Soviet Socialists' Republic) used it as well. Then after the 1972 Munich Olympics Slaughter of 11 Israelis & 4 Germans, the German Government decided it was time for a new rifle & counter terrorist unit to combat separatist & terror organizations. This is where the HKMSG90A1, HKMSG90A2, HKPSG1A1, & Schmidt & Bender Scopes become new or popular to the German Government & German Police. Also, in 1972, the GSG-9 is formed.Edit
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