Just in is a 5" 9mm barrel for my latest project. It has the 3-Lug adapter which will be getting a YHM XL sub gun suppressor. Overall with suppressor the "barrel" should be about 12.5". With the YHM Specter length hand guard that will put about 1.5-2" of the suppressor hanging out from the hand guard. This upper will be going on an M-16 lower with a 4-position trigger pack. Just thought I would share the fun.