STI International, Inc. (known as STI in the shooting community) is a Texas-based company that manufactures complete M1911 pistols and parts for competition, duty and self-defense. It is most well known for its modular frame guns (so-called because the lower grip and trigger guard, which is made of a fiber reinforced plastic, is a separate component from the metal upper portion of the frame that comprises the dust cover and frame rails). STI and Strayer Voigt Inc. share the patent on the modular frame.