The Glock 27 is a compact .40 S&W semi-automatic pistol with a 9-round standard magazine, compatible with extended magazines. Its polymer frame and Tenifer-coated steel slide handle harsh environments and daily carry. The Safe Action System delivers a consistent trigger pull with internal safeties and no external safety lever. Despite the compact size, the low bore axis helps manage recoil and allows for quick follow-up shots. The Glock 27 is commonly carried for personal defense and used by law enforcement as a backup pistol. Extended magazines from larger .40 S&W Glocks also fit the frame.