Ar pistol question

[Made in America]

Is it ok to use an A2 buffer tube on an ar pistol with a sig sb 15 arm strap?

 

[Aaron Baker]

It's okay to use an A2 buffer tube on a pistol build. The Sig SB15 is also allowed. So I don't see why they couldn't both be used. But I'm also not familiar with how the SB15 attaches normally.

Aaron

 

[Made in America]

Ok cool i thought someone said it HAS to be a pistol buffer tube my arms are a little to long for it I wonder if I have to just drill the threads so it can't take a stock and the sb15 just slips on and fits tight

 

[Theohazard]

I wouldn't recommend using an A2 buffer tube on an AR pistol. The ATF has said that it's OK to use a normal buffer tube (A2 or carbine) on an AR pistol, BUT if you also posses a stock for it you risk being busted for constructive possession of an SBR.

People use pistol buffer tubes on AR pistols because a stock can't be attached to it and therefore you avoid being busted for constructive possession. And the SB15 legally changes nothing on an AR pistol, it's still a pistol and you can still shoot it however you want; even from the shoulder if you want to.

Also, in my experience an SB15 arm brace is pretty tight on a pistol buffer tube but you can force it on. I think it works best on a regular carbine tube with the notched rail machined off and just a little left at the front to allow it to should about 1" from the receiver end plate.

 

[Made in America]

Ok yea I have no stock at All what about gluing the arm brace to the tube and gluing para cord to the rest of the tube? And do I have to drill the treads out of the back of tube

 

[Theohazard]

If you don't have any stocks that can attach to the buffer tube, you can't be busted for constructive possession. Also, in theory if you modify the tube so it can never accept a stock that means you can't be busted for constructive possession even if you have a stock. But I wouldn't glue it in place, what if you want to change something? What if you alter your shooting style and want to change the length of pull? I suggest just getting a pistol buffer tube: You don't have to modify it and the SB15 will fit tight enough that you can slip it on and move it where you want and it will stay in place.

 

[Made in America]

Thanks a lot I was just considering a longer buffer tube because my arms ar longer and the pistol tube dosnt feel right I tired one at a gun show and it felt more confertable

 

[Theohazard]

Well, with the SB-15 you're basically mimicking an SBR but without a need for a tax stamp; it's perfectly legal to shoulder an SB-15 like it was an SBR. And considering an SBR is usually used for CQB/defensive purposes, the best way to shoot an SBR is using a more CQB-style stance. Square your shoulders more towards the target, put the stock in the pocket of your shoulder, and your nose should be right up against the charging handle. With a carbine stock, this means the stock is fully collapsed (you might need to extend the stock one notch if you have long arms). With the SB-15 on a pistol buffer tube, this puts the SB-15 about one or two inches from the receiver end plate. Even with longer arms, you shouldn't need any buffer tube longer than a pistol buffer tube.

 

[Hamfisted]

Somebody on another forum did the A2 tube and all they had to do was JB Weld (metal epoxy) the screw hole in the end of the tube to comply. So that no A2 stock could be attached to the tube.... made the mindless bureaucrats happy...



-Mike

 

[kilibreaux]

Don't know why ANYONE would want a full-length buffer tube for a "pistol" build.
All that is needed is the CHEEK WELD.

 

[Theohazard]

Don't know why ANYONE would want a full-length buffer tube for a "pistol" build.
All that is needed is the CHEEK WELD.

No, you're wrong. Apparently you don't know about the SIG SB-15 "arm brace" that we've been talking about. With the SB-15 you can actually shoulder your AR pistol like it was an SBR; it works just like a stock. He wants the extra length of the rifle buffer tube so he can extend the "arm brace" out for a longer length of pull. But I pointed out that if you use a CQB-style stance with it there's no need for the extra length.

 

[Made in America]

The only reason I asked about this is because the pistol I'm looking at is set up this way and I want to make sure it's legal before I purchas it

 

[wally]

Somebody on another forum did the A2 tube and all they had to do was JB Weld (metal epoxy) the screw hole in the end of the tube to comply.

I'm not sure JB Weld qualifies as "permanent" I often use it and then release it with a bit of heat from a propane torch -- comes right off.

I think drilling out the stock mounting screw hole would be a safer bet.

You don't need the rifle buffer and spring, you can use the carbine buffer and spring with a spacer, also a safer bet as sometimes its necessary to try different buffer weights to get AR pistols running right (especially in alternate calibers).

 

[Theohazard]

the pistol I'm looking at is set up this way

This right here is a red flag. This probably means that whoever built this AR pistol was either too cheap or too lazy to get the proper part -- a pistol buffer tube -- and instead just used the parts he had lying around. So you have to wonder: where else did he take shortcuts with parts?

 

[kilibreaux]

No, you're wrong. Apparently you don't know about the SIG SB-15 "arm brace" that we've been talking about. With the SB-15 you can actually shoulder your AR pistol like it was an SBR; it works just like a stock. He wants the extra length of the rifle buffer tube so he can extend the "arm brace" out for a longer length of pull. But I pointed out that if you use a CQB-style stance with it there's no need for the extra length.

The OP didn't mention having or wanting to mount a SIG brace, but if the idea you advance is to mount a SIG brace to an rifle length buffer tube, I would be cautious as to how that might be construed by an LEO and subsequent court.
The SIG brace is ATF "approved" (meaning they haven't found any reason to black-list it yet), as mounted on a carbine length buffer tube where it is intended to clamp over and strap too, a forearm. IF one chooses to mount it to a rifle tube where it CLEARLY cannot be utilized in the manner designed, the manner submitted for ATF approval, yet equally clearly IS being used as an "ad-hoc" stock, one might end up not only getting charged with an unregistered SBR, but also causing the ATF to ban the SIG brace due to the potential for misuse.

 

[Theohazard]

The OP didn't mention having or wanting to mount a SIG brace

Yes he did. It's in his first post in this thread.

IF one chooses to mount it to a rifle tube where it CLEARLY cannot be utilized in the manner designed

This is incorrect. Functionally, an SB-15 works just as well as an arm brace when it's mounted on a rifle tube or a pistol tube. The rifle tube is just a little bit longer. In fact, it's easier to slip onto a rifle tube; it takes quite a bit of force to slip it onto a pistol tube. I've tried both.

yet equally clearly IS being used as an "ad-hoc" stock, one might end up not only getting charged with an unregistered SBR

This is another common misconception with the SIG SB-15 arm brace. But it doesn't matter if you shoulder it or not. All that matters is if your rifle is configured as a pistol or an SBR. Adding the SB-15 changes nothing to the designation of an AR pistol. Period. The ATF cannot control how you shoot your guns; you can shoulder it all day and it's perfectly legal.

Now, the only problem you could have with a rifle (or carbine) buffer tube on an AR pistol is this: If you possess the stock for it you could be charged with constructive possession of an SBR. This is why people use pistol buffer tubes or they machine the buffer tube so it can't accept a stock. But the addition of an SB-15 changes nothing.

but also causing the ATF to ban the SIG brace due to the potential for misuse.

Have you tried using it as an actual arm brace? It's TERRIBLE. Nobody actually shoots it like that, it makes the gun worse in every way. The whole thing is an obvious attempt to make an AR pistol work just like an SBR, and everyone knows it, including the BATFE. Either they don't care or they can't come up with a good technical reason to ban it because they can't regulate HOW a gun is fired, only how it's designed. And, officially, it's designed as an arm brace. If they were going to ban it they probably would have by now.

 

[Made in America]

The only reason I ask is because a guy has it set up this way and I want to make sure it's legal to purchase and iv ordered the kak pistol buffer tube that's made just for the sig sb15

 

[Sam1911]

Sounds like this is asked and answered?

 

[Made in America]

Yes I just ordered a kak pistol buffer tube

 

[Sam1911]

Awesome.