Building an AR pistol

[Krp7894]

I’m currently building an AR pistol and I have an extra buffer tube handy. It’s milspec by spikes. I was wondering if when I purchase the pistol brace I would be able to use the buffer tube/castle nut combo or is that a no no? Do I have to buy a pistol buffer tube and buffer?

[grizzman]

Pistol braces now exist that use a standard mil-spec diameter carbine receiver extension, and one example is SB Tactical's SBA3.

I haven't been able to use my SBA3 yet, since I haven't purchased the short upper yet, but I expect it to work well.

If the brace you choose is designed to use a standard carbine receiver extension, then it should be totally legal to use your existing one.

If using a receiver extension that didn't come from the manufacturer with the brace is considered modifying the brace, and therefore
illegal, then that illustrates the level of ridiculousness that the BATFE exhibits.

[Five_Point_Five_Six]

You can use any buffer tube you'd like on an AR pistol.

[Krp7894]

So if I just purchase the brace without an extension tube I’m GTG?

Also, I should mention this lower was purchased about two years ago from a gun store and is listed as “other” on the paperwork which I still have. The lower was stripped and I since put a LPK with a buffer tube on it.

[Onyx Z]

So if I just purchase the brace without an extension tube I’m GTG?

Also, I should mention this lower was purchased about two years ago from a gun store and is listed as “other” on the paperwork which I still have. The lower was stripped and I since put a LPK with a buffer tube on it.

The SBA3 comes with a standard mil-spec buffer tube to appease the law that it is a pistol buffer/brace system and not a modification to a rifle system. And yes, the SBA3 will fit on a standard mil-spec buffer tube purchased aside from the brace.

To my knowledge, the SBA3 is the only brace that will fit a standard mil-spec buffer tube.

[Krp7894]

The SBA3 comes with a standard mil-spec buffer tube to appease the law that it is a pistol buffer/brace system and not a modification to a rifle system. And yes, the SBA3 will fit on a standard mil-spec buffer tube purchased aside from the brace.

To my knowledge, the SBA3 is the only brace that will fit a standard mil-spec buffer tube.

As long as it’s legal then I’d just slide the new brace over my existing buffer tube. That way I don’t have to break off the castle nut and start again.

[Onyx Z]

As long as it’s legal then I’d just slide the new brace over my existing buffer tube. That way I don’t have to break off the castle nut and start again.

That's up to you. I'm not a lawyer and I don't pretend to play one on TV, so take that FWIW.

[Krp7894]

That's up to you. I'm not a lawyer and I don't pretend to play one on TV, so take that FWIW.

Understood. What about ordering the upper online? I’ve ordered 16” uppers before but can I have an 8.3” upper sent to my house or does that go through an FFL? I live in NY.

[MistWolf]

You can use any RE you want on a pistol. Just don't use a stock.

[Wake27]

Understood. What about ordering the upper online? I’ve ordered 16” uppers before but can I have an 8.3” upper sent to my house or does that go through an FFL? I live in NY.

I would’ve guessed AR pistols wouldn’t even be legal in NY.


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