Each STI gun is handcrafted by a certiﬁed gunsmith and goes through over 30 quality checks before it leaves the building. STI uses only the highest quality parts available throughout the builds. Each sear and hammer is EDM wire cut, which is an innovation that helped STI make a name for itself years ago. Every part that STI manufactures is built to oversized tolerances so they can be hand ﬁt to each individual gun. Each gun is fully function tested and meticulously inspected for any blemishes. The completed STI gun represents some of the ﬁnest in handgun custom quality, performance and accuracy.