GLOCK 42 For Sale For those discerning shooters who desired the smallest GLOCK possible, the company responded with the now popular GLOCK 42 in 380 AUTO with ultra-compact dimensions and easy-to-shoot characteristics. The GLOCK 42 packs all the features GLOCK customers have come to appreciate – from the GLOCK SAFE ACTION system with its multiple integrated safety features to the brand’s proven reliability and durability.