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My Tac-13 was listed as a "Firearm" and I was warned by the shop that I could not carry it concealed as I could with a handgun. because it is NOT a pistol.
But I was able to find a brace for it!
You can put a brace on 'firearms' such as the Tac-14/Shockwave because the brace is not a stock, it is an accessory. It does not change the classification of any firearm, whether it is a rifle, a pistol or a 'firearm'. I have a brace on one of my Shockwaves. Note that if the brace is a folding brace, that because it is an accessory the OAL is measured with the brace folded - just like it is with a pistol, unlike a rifle.
You can also put a vertical grip on the forearm of a Tac-14/Shockwave because they are not pistols.
You can also replace the raptor grip with a pistol grip, as long as the OAL length of the 'firearm" remains 26"+. An example is the Knoxx breacher grip.
What you cannot do is put a stock on a 'firearm' - at least not without also putting an 18" barrel on prior to putting the stock on it. I am guessing the if you put a stock and 18" barrel on a 'firearm' (such as the Shockwave), that you could not go back to it being a 'firearm' as the interpretation of the law (by the ATF) is that the 'firearm' is a firearm because it was never a shotgun because it never had a stock on it. If you put a stock on it, then it is a shotgun, and therefore it cannot go back to being a 'firearm'.
This seems to be a grey area for a number of reasons:
1) I have never seen this addressed in any articles, much less ATF rules/regs/FAQs.
2) I have never seen any court cases on this. Yet.
3) My personal observation of Mossberg Shockwaves is that there is nothing on the firearm that denotes it is anything other than a Mossberg model 590.
I assume therefore that the only way any LEO would know for certain that a particular Mossberg model 590 is a Shockwave and not a shotgun with a 13" barrel, would be by checking the serial number.
Conversely, the only way that a LEO (e.g., an ATF agent) would know that a Mossberg Shockwave ever had a stock and 18" barrel on it (thereby making it a shotgun) would be if for whatever reason, they checked (or officially recorded/noted somewhere) the serial number of the 'firearm' while it was in that configuration.
So I am going by my personal interpretation and reading of the laws/regs/etc. which may be completely wrong.
Personally, to avoid any such issues, I would just never put a stock on a Shockwave, whether it had the 18" barrel or not: I find that I can shoot the Shockwave with the brace, almost as effectively as with a stock. If I want to put an 18" barrel on it, then I can do that while not adding a stock, thereby never changing the classification of the gun from a 'firearm' to a shotgun, and avoiding any legal issues later when I put the shorter barrel back on it - while also probably avoiding issues in locales where the Shockwave 'firearms' are not legal (California?).