Backup Tactical Threaded Barrel, 9MM, For Glock 17, Black Finish G17TB-BLK Backup Tactical produce their barrels in SMALL BATCHES so they can focus on machining each barrel to the most exacting standards and tolerances in the industry. The result is MATCH GRADE ACCURACY and a PRECISE DROP-IN FIT. Accuracy and fit are paramount" but their parts have to look cool too.