Welcome to the STI Gun Parts section of Midwestgunworks.com. We are glad to be able to offer parts for most current production STI firearms. Parts are available to the public for self installation, but they can also be installed by our highly trained gunsmiths. Midwest Gun Works Gunsmiths can offer you the knowledge and skill that your STI firearm deserves. If you don't see the model you are looking for, keep checking back, we are constantly expanding our inventory. To begin shopping click on your model below and enjoy!