GUNSTRUCTION is a web application that allows you to build and customize AR15’s using real-life parts. Using GUNSTRUCTION you can test fit parts, check co-witnessing, see how different parts interact with each other and get an overall feel of how your AR15 will look. GUNSTRUCTION is made up of veterans from the Video Game Industry who also happened to be total gun fanatics. Tired of the lack of quality Builders available, they set out to create their own. GUNSTRUCTION is free to use on the web.