The legality of threaded barrels in semi-auto pistols is regulated by the
Guidelines Regarding the "Substantially Identical" Provision in
the State's Assault Firearms Laws:

http://www.state.nj.us/lps/dcj/agguide/assltf.htm

A threaded barrel is one (#2) of the five named "evil" features, and the presence of any
two of those would make a pistol into an "assault weapon" (i.e., illegal) in NJ.

In the case of Glocks, the main issue is the "evil" feature #5; whether a pistol is
"a semi-automatic version of an automatic firearm". Since Glock 18 is a select-fire
machine pistol, there is an opinion that Glock 17 is "a semi-automatic version of"
Glock 18, and therefore a Glock 17 with a threaded barrel would be illegal in NJ.
For example, PK90 seems to be adhering to this position:

http://njgunforums.com/forum/index.php/topic/29933-threaded-barrel/#entry394581

On the other hand, the NJ Gun Law Summary by vladtepes:

http://njgunforums.com/forum/index.php/blog/1/entry-16-nj-gun-law-summary/

specifically states that: "A glock (which is a semi automatic pistol that
has a detachable magazine ) with a threaded barrel. LEGAL"

I would like to know if there has been any consensus opinion reached on this issue.
This issue is complicated by the semi-mysterious existence of Glock 18: neither
the US nor the EU sites of Glock have any mentioning of Glock 18. I suppose it does
not imply that Glock 18 is legally non-existent in NJ. I cannot find any official
technical information on Glock 18. Every available Internet source states that
Glock 18 and Glock 17 are actually incompatible:

http://www.cybershooters.org/dgca/prod01.htm

One cannot put a Glock 18 slide on a Glock 17 frame. This seems to invalidate the claim
that Glock 17 is "a semi-automatic version of" Glock 18. However, until this position
is confirmed by the NJSP, I suppose one would still take a risk by using a threaded
barrel in Glock 17.

Another murky issue is the use of threaded barrels in, say, Glock 22. To the best of
my knowledge, Glock has never made anything in .40S&W with a full auto capability.
This seems to provide very strong support to the position that Glock 22 is NOT
"a semi-automatic version of an automatic firearm", and therefore threaded barrels
should be perfectly legal in Glock 22. However, there exist various full auto conversions
(illegal in the US!) for Glock 22, or any other Glock for that matter, see, e.g.

http://www.defensereview.com/select-firefull-auto-glock-22-40-sw-machine-pistol-at-the-range-sts-arms-select-fire-backplatebackplate-fire-selector-switch-for-glock-pistols-video/
and
http://www.thefirearmblog.com/blog/2011/03/04/how-to-make-your-glock-fully-automatic/

I wonder if that would put at risk the use of a threaded barrel in any Glock in NJ.
Of course, in my view, such a position should have no legal standing, since with
sufficient ingenuity, almost any semi-automatic pistol can be converted to full auto.
Any informed opinion on this issue would be highly appreciated.
is there a way to get a definitive answer to these questions?

You get one evil feature on a pistol and still legal.   So, a threaded barrel is legal on all glocks except maybe the 17. 

 

ii. A semi-automatic pistol that has an ability to accept a detachable magazine and has at least two of the following:
(1) An ammunition magazine that attaches to the pistol outside of the pistol grip;
(2) A threaded barrel capable of accepting a barrel extender, flash suppressor, forward handgrip, or silencer;
(3) A shroud that is attached to, or partially or completely encircles the barrel and that permits the shooter to hold the firearm with the non-trigger hand without being burned;
(4) Manufactured weight of 50 ounces or more when the pistol is unloaded; and/or
(5) A semi-automatic version of an automatic firearm; and

You can add the Beretta 92 to that list with the G17 as its the semi version of the 93r.

I'd say you are good to go for two reasons

 

1) The Glock 17 came out first, the 18 (later) is an automatic version of the 17.  

2) The whole 'substantially identical' part was challenged, and the AG revised it to be '100% identical'.  Hence, all the AR-15, ak47, and mp5 clones that are 100% NJ legal, despite having 100% parts compatibility, etc.

 

Ergo, no one is going to give you a hard time with a threaded pistol barrel.  The Glock18 didn't necessarily come with a threaded barrel, did it? And the 93r has a little forward grippy thing that makes it quite different.

 

Can a cop or prosecutor give you a hard time over anything?  Yes.  Most likely you will not end up in a position where you have to defend it.

I'd sell you one. Different model number and different components. The Colt 6940, for example, is legal in NJ.

 

From another thread:

 

A Colt 6940 has much more against it than my pistol:

• Threaded barrel with a flash hider (can solved by permanently affixing a legal Branson brake almost identical to the flash hider)
• Bayonet lug (usually ground off)
• Six-position stock (usually pinned)
• Comes standard with two 20-round Colt magazines (permanently reduced to 15 rounds or replaced with aftermarket magazines in 10 or 15 round capacity)
• The ability to accept a detachable magazine (usually retained as one of two permissible evil features)
• A pistol grip that protrudes conspicuosly beneath the action (usually retained as one of two evil features)

Finally, this seems the most damning strike against the 6940: "The LE6940 has extensive parts commonality with the M4 . . ." and "the Colt LE6940 Advanced Law Enforcement Carbine is best thought of as a semi-automatic-only version of the M4"
http://www.americanr...x?id=2324&cid=4
 

 

Link to original thread: (http://njgunforums.com/forum/index.php/topic/50801-help-me-save-my-masterpiece-arms-defender-urgent/) 

2) The whole 'substantially identical' part was challenged, and the AG revised it to be '100% identical'.  Hence, all the AR-15, ak47, and mp5 clones that are 100% NJ legal, despite having 100% parts compatibility, etc.

 

 

 

I was unaware of this revision. Thanks for sharing.

I'd say you are good to go for two reasons

 

1) The Glock 17 came out first, the 18 (later) is an automatic version of the 17.  

2) The whole 'substantially identical' part was challenged, and the AG revised it to be '100% identical'.  Hence, all the AR-15, ak47, and mp5 clones that are 100% NJ legal, despite having 100% parts compatibility, etc.

 

Ergo, no one is going to give you a hard time with a threaded pistol barrel.  The Glock18 didn't necessarily come with a threaded barrel, did it? And the 93r has a little forward grippy thing that makes it quite different.

 

Can a cop or prosecutor give you a hard time over anything?  Yes.  Most likely you will not end up in a position where you have to defend it.

Can you refer us to where we can find this revision from the AG in print?

I agree with what is stated here... I believe the intention of semi auto version of an automatic exists to apply to all of those fun little spray and pray guns... Not regular pistols... I believe the intention of the law to be literal... And that is a semi auto version of a full auto... As others stated the semi auto glock is what came first... And more importantly is the norm.. It is not that the glock is typically full auto and the semi auto version has been created as an after thought..