DPMS site shows cartoon pic of slip-over (which I figured you wouldn't be interested in) and installed it will look like pic I posted, sorry I don't have one, but really think it will look as pictured in my post. Only difference is, on the slip-over the threading is up inside and just back of slots and
WILL get you enough length on a 14.5" barrel to be legal but will make your 16" barrel about 1/2" - 5/8" longer.
Mike
Edited post to revise info on 14.5" barrel + slip-over FS.
If drawing is to scale than installing of slip-over should result in a total OAL of 16.3".