Pistol Stabilizing brace on a Mac10 type weapon?

rcm192 · Dec 16, 2013

So during my current build of my AR pistol with a Sig PSB15, I started to wonder if anyone here on BS has used this type of adapter from USmachinegun for a Masterpiece Arms in junction with a PSB?

http://www.usmachinegun.com/proddetail.php?prod=MPA9-0136

I called us machine gun and inquired about the configuration. As soon as I mentioned the PSB he instantly transformed into a chotch. He started stuttering and claiming how the product was a complete piece of junk. LOL. It seems like he really hates that product. I just thought it was comical because this is the guy who makes upgrades for Mac10 type weapons. :mamoru:

Oh well, its just an idea.

Rahllin · Dec 16, 2013

In my opinion... that would just be a stock, thus making that gun an SBR. On an AR pistol the buffer tube is required for the gun to function, on this, whatever it is, the "buffer tube" is just something to be used as a stock. Correct me if I am wrong.

rcm192 · Dec 16, 2013

Rahllin said:
In my opinion... that would just be a stock, thus making that gun an SBR. On an AR pistol the buffer tube is required for the gun to function, on this, whatever it is, the "buffer tube" is just something to be used as a stock. Correct me if I am wrong.

The PSB is a brace, its not a stock. A pistol buffer tube is considered a receiver extension. A pistol buffer tube is not designed to accept a shoulder stock. A stock is a device that is meant to be put to ones shoulder in order to fire a weapon. The PSB was designed to be wrapped around ones forearm to aid in shooting with one hand.

Rahllin · Dec 16, 2013

rcm192 said:
The PSB is a brace, its not a stock. A pistol buffer tube is considered a receiver extension. A stock is a device that is meant to be put to ones shoulder in order to fire it. The PSB was designed to be wrapped around ones forearm to aid in shooting with one hand.

Oh, I understand about the PSB. I am about to get one myself after seeing my friend's recent build. I just don't see how just adding a "receiver extension" to a gun that doesn't make use of it would be kosher, but I am by no means an expert. I just find it odd that on the website you linked to that product, in the description the guy clearly states that "this item may require additional paperwork to be filed with the ATF." The SigTac SB15 was given to the ATF and cleared before being sold, obviously this thing hasn't because the guy who makes it doesn't even know what it is classified as.

Don't get me wrong, I would love to be able to slap a tube and PSB on any "handgun" and rock and roll with it, but I also don't think it should be illegal for me to own an SBR without jumping through hoops.

enutees · Dec 16, 2013

Rahllin said:
Oh, I understand about the PSB. I am about to get one myself after seeing my friend's recent build. I just don't see how just adding a "receiver extension" to a gun that doesn't make use of it would be kosher, but I am by no means an expert. I just find it odd that on the website you linked to that product, in the description the guy clearly states that "this item may require additional paperwork to be filed with the ATF." The SigTac SB15 was given to the ATF and cleared before being sold, obviously this thing hasn't because the guy who makes it doesn't even know what it is classified as.

Don't get me wrong, I would love to be able to slap a tube and PSB on any "handgun" and rock and roll with it, but I also don't think it should be illegal for me to own an SBR without jumping through hoops.

I still think they'll be banned at some point retroactively. We'll wait and see. But to your point, they are selling them on AK pistols now as well. And those don't have buffer tubes obviously.

rcm192 · Dec 17, 2013

enutees said:
I still think they'll be banned at some point retroactively. We'll wait and see. But to your point, they are selling them on AK pistols now as well. And those don't have buffer tubes obviously.

This was going to be my next point. I just wonder how just because it would be on a Mac10 it would make it unlawful. Afterall the PSB is in no way considered to be a stock. It was never designed to be shouldered.

Here's the letter that we've all seen from the ATF:
http://www.sigsauer.com/upFiles/ATF-Compliant-Letter.pdf

It does mention "AR type" firearms as far as what it is designed to be applied to. I also searched for a SB47 to see if there was a separate letter for the AK model but there isnt pne posted on their sight probably because its the same exact product.

rcm192 · Jul 11, 2014

Still entertaining the getting one of these MPA pistols with a side folder set up.

Hedwig · Aug 21, 2014

Good stuff.

I built one of the MPA mini 9mm pistols with a Burris Fastfire 2, machine gun style barrel extension and a folding arm brace. If I'm able to figure out how to do it I'll upload a picture from my phone. Do not by the cheap Amazon folding bracket. It's garbage.

Rainsdrops · Aug 21, 2014

How much does weigh? My mpa10 .45. Weighs around 8lbs loaded. After running through a few mags, it gets quite heavy.
A nice horizontal grip mounted to the fake can, seems more practical. As it would allow one to operate the pistol with 2 hands, and stay within the law

rcm192 · Aug 22, 2014

This is still on the back burner for me. I really want this set up as a fun range toy for when my octane 45 arrives.

kingfhb · Aug 22, 2014

The ATF letter recognizes in general that the way you hold your weapon does not reclassify it.

I don't see why the SB47 wouldn't work on your weapon though. It looks like it may. Also, just because they don't make one that is designed specifically for your weapon, doesn't mean you can't use it on a weapon that it will work on.

With that being said... if you use the adaptor you've linked to, it is not illegal to add a pistol buffer tube and shoulder it. Again, how you hold your weapon does not change it's classification. It is considered to be a receiver extension on a pistol.

rcm192 · Nov 17, 2014

Look what i found...for anyone who is interested..http://masterpiecearms.com/shop/mpa-sb15-arm-brace-package-9mm57/

rcm192 · Nov 17, 2014

Hedwig said:
I built one of the MPA mini 9mm pistols with a Burris Fastfire 2, machine gun style barrel extension and a folding arm brace. If I'm able to figure out how to do it I'll upload a picture from my phone. Do not by the cheap Amazon folding bracket. It's garbage.

Any pics yet? Also which side folding bracket did you use?

rcm192 · Dec 21, 2014

Found pics of one for those who are interested...

Pistol Stabilizing brace on a Mac10 type weapon?

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