Question: what is the caliber of a glock 18
Answer: built 5,000,000 as of 2007 Variants See Variants Specifications Cartridge 9 × 19 mm Parabellum ( Glock 17 , 17L , 18 , 19 , 19X , 26 , 34 , 43 ) 10 mm Auto ( Glock 20 , 29 , 40 ) .