The A1 and A2 birdcage flash suppressors are not long enough to bring a 14.5" barrel up to 16" legal length so the barrels that have them installed are 16" or longer so they are removable.
The 14.5" barrels do have Izzy, Phantom and Phantom 2 suppressors permanently installed as they are long enough to bring the barrel up to 16" legal length.
If the barrel measures 7" from the front of the front sight base to the end of the suppressor it is permanently attached.
If the barrel measures 8-1/4" from the front of the front sight base to the end of the suppressor it is removable.
For a list of some of our flash suppressors, please check out our online store here.