Its for an "Other" build. Specifically the Palmetto State Armory complete upper with the PSA "flash can". I dropped it off to my local FFL and was told by the gunsmith that because you can fit your finger inside of it, its illegal. As this conversation was commencing another employee told the worker that he was wrong and it was legal because its considered a linear compensator. Needless to say they are now going to pin/weld the muzzle on however still left me feeling worried. For a little info about the build : 10.5 inch PSA Upper with 3" flash can (Makes it over 26" when pin/weld is done). Anderson lower with SBA3. VFG installed to make it a legal "other".
Also a discussion about building an other was brought up while I was in there. That same employee stated you cant build an other because it doesnt have "other" engraved. Again the other employee stated that he was wrong. I am tired of getting different answers from people who are supposed to give you legal advise. This was at a gun store in my area. Thank you