Just wondering if the B.A.D. saber tube (mid length) is legal to put on a pistol build. I am having trouble finding the answer and have not heard back from battle arms yet.

Thanks guys!

No. It specifies in the description that it is a stock.

I disagree so long as certain conditions are met.
1.  You do not have the 'stock' part attached to the receiver extension unless there is a longer than 16" upper attached.

2.  If the pistol is the only AR you own, you should not be in possession of the 'stock' part.

This would be the same as using a CAR RE for a pistol build which is perfectly legal so long as the above conditions are met.

So there are requirements beyond the non adjustable stock?
New to the pistol build so trying to figure out the odds and ends.

Thanks guys

Adjustable, non-adjustable, you can NEVER put a stock on a pistol, period.
The device you mentioned with the shoulder part attached to the buffer tube makes it a stock, and you cannot do that on a pistol, adjustable or not.  Without the shoulder piece, all you have is a buffer tube, the same as using a CAR buffer tube on a pistol build.

Legal:
Build first as a pistol with your short barrel pistol upper and buffer tube only, no stock/shoulder piece of any kind.  Then, if you want, you can remove the short barreled upper and put on an upper with a 16" or longer barrel, then you can attach the shoulder piece and make it temporarily into a rifle.
Pistol first, then to rifle, and back to pistol = 100% LEGAL.
To covert back to pistol, remove shoulder piece, remove rifle upper, attach pistol upper.  Completely legal,
You can never attach the shoulder piece on the buffer tube with the pistol upper attached UNLESS you SBR the lower first.

This is the same procedure you would use if you were using a standard CAR buffer and had a shoulder stock that fits the buffer tube and an upper with a barrel of 16" or more.

If you do not own a rifle length upper or another AR rifle then you cannot legally have the piece that attaches to the buffer tube which makes it a stock, since the only way those parts could be assembled would be as an illegal SBR.

So the one I posted is illegal but the shockwave blade is fine to use?

Yes, the Shockwave is legal to use on a pistol build.

The ShockWave Blade and the SigBrace and others like them have been ruled as legal to use on pistols because they are not to be used as stocks but rather simply arm braces, and for God's sake, let's not get into the whole ATFE debacle about what happens if they touch your shoulder.  There are hundreds of posts on that crap-a-thon so get busy reading to understand why the Blade and the Brace are legal to use on pistols but the one you referenced in the OP would not be legal in its complete form and why it would be legal if the shoulder piece is removed as long as the before mentioned conditions were met.

I am not trying to cut you off but it looks like this thread is headed into territory that has been discussed, argued, and hashed over and over again ad nauseam so there is no point in people reposting all that stuff again.

Here is one of the many threads that Bigbore is talking about.

http://www.ar15.com/forums/t_3_122/712662_BREAKING--ATF-reverses-decision-on-shouldering-arm-braces.html

The TUBE is perfectly fine to put on your pistol...just not the stock portion