Description The APEX Tactical Barrel Fitting Jig is an essential gunsmithing tool designed for precision fitting of Apex grade M&P barrels and other aftermarket M&P and Glock barrels. Constructed from durable aluminum, this jig simplifies the fitting process, ensuring a perfect match for your firearm. With a compact size of 5.05 inches in length, it is easy to handle and store. Apex recommends using a 1/2″ safe edge file with the jig for optimal results (file not included). Elevate your gunsmithing skills with this reliable and effective barrel fitting jig.