You would have to define best- what what use.
100-400 USD
Very likely, it's the Glock. Glock in general is the best selling pistol in the commercial and law enforcement market.
A Glock 22 (.40 cal) and a Glock 27 (.40 cal) as a backup.Actually the standard NYPD sidearm is a Smith & Wesson 5946, Glock 19, and formerly the SIG-Sauer P226.
No. 10mm is close to .40 cal, smaller than .50 cal.
Depends on condition, accessories, etc.. Price range from 250-500
No one answer- usually 2-3 letters, and they vary depending on the model.
100-400
No. The 357 SIG magazine will not fit in a 40 caliber Glock such as the model 22.
No. The 9mm is not compatible with the .40 caliber frame/slide. On the other hand, you can put a .357 SIG barrel into a Glock 22 and use your .40 magazines.
Glock 22 .40 cal handguns
No such thing. The Glock is not a double action firearm.
Glock 22 .40 CAL