Originally Posted by rccalzadilla
What does it mean "as long as pinned"?
They pin and weld the muzzle device to the 14.5" barrel to obtain the 16" required by law.
A 16" barrel is usually almost 18" by the time you put a muzzle device on it. Piining the MD on a 14.5" barrel gives you a shorter overall barrel yet you still have the 16" ordered by law.