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?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. 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.

1. Ak 47 Folding Arm Brace

Ak 47 Folding Arm Brace

Oh well, its just an idea. 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. 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.

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. 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: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.