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Rifle with 5" 9mm barrel with long barrel shroud legal in NJ?

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Looking to build a 9mm PCC rifle for competition.    The 2 barrels I'm considering are Odin Works Super Lite and the Taccom ULW barrels.  These are 5" 9mm barrels with long aluminum barrel shrouds to make them rifle legal 16".  The opening of the barrel shroud is the OD of the barrel, meaning you can stick your finger in it.   Would NJ consider these flash hiders since the opening is bigger than the bullet?  Does having ports vs not having ports (like the middle pic) make a difference?  

 

ODIN WORKS ROLLS OUT NEW 16" SUPER LITE 9MM BARRELS - ATTACKCOPTER

 

 

taccom-ulw-9mm-pcc-barrel-pic3.jpg

 

taccom-1016-barrel-pic1.jpg

 

 

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Odin Works describes theirs as having a muzzle brake pinned on top.  Taccom looks to be straight shroud so nothing on it...  Technically it would be legal but why would you want these?  If it's weight, you're saving 7oz vs a 16" barrel..  And if you're going with a full rifle you'd still have to do the fixed or pinned stock.  Why not just go for a 16" barrel?  Or alternately go and build a non-NFA other?

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Its for competition.  PCC class requires that it is fitted with a stock, and pistol braces are not allowed in the series so can't do an Other and need a 16" barrel.   9mm velocities out of barrels longer than 10" usually require different buffer systems.  Lighter weight out front helps with transitions.  

 

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8 hours ago, Krdshrk said:

Odin Works describes theirs as having a muzzle brake pinned on top.  Taccom looks to be straight shroud so nothing on it...  Technically it would be legal but why would you want these?  If it's weight, you're saving 7oz vs a 16" barrel..  And if you're going with a full rifle you'd still have to do the fixed or pinned stock.  Why not just go for a 16" barrel?  Or alternately go and build a non-NFA other?

Short barrel lets the bullet get out of the barrel sooner which significantly reduces dwell time. This unlocks everything before the BCG slams into the back of the receiver extension which causes the first of two “bounces”’ in a traditional straight blowback AR pistol caliber carbine. The usual fix for that is a heavier spring and buffer - but that creates its own problems on the front end where the BCG then slams back into battery harder than it needs too creating a noticeable second “bounce”.

With the short barrel, the corresponding shorter dwell time will feel like it is shooting softer and smoother with no “bounce” affecting control or sight picture. If tuned correctly, the BCG and buffer will now float in the receiver extension and then slide smoothly back into battery with minimal energy.

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