<Tr> <Th> Effective firing range </Th> <Td> 50 m (55 yd) (Glock 17, 17C, 18, 18C) </Td> </Tr> <Tr> <Th> Feed system </Th> <Td> Box magazine </Td> </Tr> <P> The Glock pistol is a series of polymer - framed, short recoil - operated, locked - breech semi-automatic pistols designed and produced by Austrian Glock Ges. m.b.H. . It entered Austrian military and police service by 1982 after it was the top performer in reliability and safety tests . </P> <P> Despite initial resistance from the market to accept a perceived "plastic gun" due to unfounded durability and reliability concerns and fears that its use of a polymer frame might circumvent metal detectors in airports, Glock pistols have become the company's most profitable line of products as well as supplying national armed forces, security agencies, and police forces in at least 48 countries . Glocks are also popular firearms among civilians for recreational and competition shooting, home and self - defense, and concealed carry or open carry . </P>

Is glock a brand or type of gun
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