Will the Knight’s M4QD Flash Suppressor bring a 14.5" barrel up to legal length(when perm attached)?

Not as it is, but I think it will with a lot of shims or a spacer.
Dustin
Would be better off running a 14.7".
Running a lot of shims can be perilous for suppressor attachment, which I’m assuming is your reason for using that hider.
Thanks guys.