COLT SMG UPPER RECEIVER OPTIONS

The Barrel is an additional funds selection from Foxtrot Mike, and it is 16 inches very long. Extended for just a 9mm, but a rifle can be a rifle and I want that sixteen-inch barrel to make it so. The Foxtrot Mike barrels are remarkably straightforward.  I haven't selected a flat best or A1 (without having FA and deflector).  I'm imagining a 16"