No. Strictly speaking, Glocks are "safe-action" which is a Glock proprietary term. Glocks are neither double action nor single action. They have attributes of both types.
No such thing. The Glock is not a double action firearm.
A Glock 19 is a pistol. The Glock 19 is their compact, 9mm, 15 round, pistol.
No. The Glock is an auto pistol. With the exception of the .357 Sig, auto pistols do not shoot .357 cartridges.
The Glocks are striker fired pistols, not DA... there is no SA option, because the design of a striker fired pistol doesn't use a hammer, and it cannot facilitate such an action.
It only comes as a striker fired pistol - the design cannot accommodate a SA-type action (and the existing action isn't DA, to that end, as the striker fired mechanic is much different from a hammer fired mechanism).
Yes, the Glock 18 is fully automatic.
'Glock' usually refers to a 9mm pistol manufactured by Austrian arms company, Glock.
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.
Caliber is .45 GAP (Glock auto pistol)
Glock describes their action design as "safe-action," and it has characteristics of both single- and double-action designs. Like a single-action, chambering a round sets the striker (firing pin) mechanism, but like a double-action that striker is pulled back farther by pulling the trigger. The idea behind the design was to have a shorter and lighter trigger pull than a DA gun, but not to have a fully cocked striker ready to fall like a SA gun, without requiring a manual safety like SA guns.
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One is on the trigger