The Glock 19 is their compact, 9mm, 15 round, pistol.
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Yes, the Glock 18 is fully automatic.
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'Glock' usually refers to a 9mm pistol manufactured by Austrian
arms company, Glock.
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A Glock 45 is a semi-automatic pistol. Glock pistols are a very
popular type of pistol. In particular many law enforcement agencies
in the US use them.