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Lower receiver for pistol or rifle

1517 Views 11 Replies 7 Participants Last post by  itzdapig
If you build a lower with a pistol receiver extension and mount an upper with a barrel shorter than 16", it technically is a pistol. Can you then interchange uppers with a barrel longer than 16" and add a slip on stock to the pistol receiver extension and be legal?

In other words, 1 lower, serving dual function as a pistol and a rifle, by changing uppers and adding a removable stock that fits the pistol receiver extension.
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Way I understand it is yes. You can convert a pistol into a rifle and back into a pistol, so long as it is never in a NFA configuration (SBR). If it starts out as a rifle it can only be a rifle.
As long as it is first built as a pistol you can swap it back and forth all you want. If it was first built as a rifle it must always be a rifle. You can also use the Thordsen cheek saddle on it in pistol form with a carbine buffer tube. It is legal because it requires tools to remove so it is not "readily" converted to a rifle.
This is a good thread to answer some of my questions too if I may hijack here.

Isn't a pistol just another way to create a SBR of sorts? What exactly does a pistol have that a short barrel rifle does not or vice versa?
Isn't a pistol just another way to create a SBR of sorts? What exactly does a pistol have that a short barrel rifle does not or vice versa?
It's more the other way around: What exactly does a SBR have that a Pistol does not? A stock and $200 worth of tax stamp (if its legal). SBRs and Pistols use all the same parts except the pistol can't have a stock and generally needs to have a pistol buffer tube. There are a few exceptions to the buffer tube as noted by Woodstock.

Pistol is usually a holding point on the way to building an SBR. Most people want to build an SBR, but don't want to wait for the stamp to start building and shooting. They'll build and shoot it as a pistol while waiting for the form 1 to be approved. Once it's approved they install a stock and appropriate buffer tube.
This is a good thread to answer some of my questions too if I may hijack here.

Isn't a pistol just another way to create a SBR of sorts? What exactly does a pistol have that a short barrel rifle does not or vice versa?
No a pistol is not another way to create an SBR.

Lack of a butt stock is what's lacking on a pistol vs an SBR. It's also illegal to shoulder a pistol with a pistol brace attached.

Sent from a final firing position, the crosshairs are on you!
Original configuration as a rifle=always a rifle without a stamp.

Original configuration as a pistol= swap back and forth from a 16" to 16" + barrel in a rifle configuration back to a pistol as much as you want.


Sent from a final firing position, the crosshairs are on you!
This is a good thread to answer some of my questions too if I may hijack here.

Isn't a pistol just another way to create a SBR of sorts? What exactly does a pistol have that a short barrel rifle does not or vice versa?
SBR has a stock that you can shoulder and a pistol has a buffer tube which you can not shoulder (not comfortably anyway)
Just forclarification. Does this hold true only if originally purchased as a complete registered rifle lower. If I build my own lower as a rifle and later change it to a pistol configuration who would know that it was originally built as a pistol other than me!
Just forclarification. Does this hold true only if originally purchased as a complete registered rifle lower. If I build my own lower as a rifle and later change it to a pistol configuration who would know that it was originally built as a pistol other than me!
If you build it as a rifle first it can never be a pistol period. That is the way the law reads. What you do is up to you. Take your own chances. FYI there is no such thing as a registered rifle lower. A lower regardless of configuration is transferred as "other". It doesn't matter if it is built in rifle configuration, pistol configuration or stripped. Same same. If you buy a complete lower with a butt stock on it you can still use it as a pistol lower as long as it has never been completed and built into a rifle (upper installed).
Just forclarification. Does this hold true only if originally purchased as a complete registered rifle lower. If I build my own lower as a rifle and later change it to a pistol configuration who would know that it was originally built as a pistol other than me!
As Woodstock stated. A new Lower stripped or assembled with no upper is listed as other" on the 4473.

The letter of the law is specific. As for who would know if you broke it is for the person(s) enforcing that law to determine, however posts like this and any pictures of said happening could suggest willful intent or the crime.

The 4473, the original transfer of said lower stripped or assembled or assembled as a firearm tells the tale.

Not saying you would do that, just pointing it out. Just another bureaucratic hurdle.

Sent from a final firing position, the crosshairs are on you!
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