If I own an SBR with a 10.3" bbl, am I essentially married to that barrel for life? I know I can swap other barrels/uppers onto the registered lower, but I vaguely recall reading that I need to be able to return the rifle to its registered configuration. Does that mean I should never sell/trade the barrel/upper that’s on it now for, say, a 12.5" upper?
Since the lower is the registered part, any upper will be fine using that lower whether NFA or Non-NFA. I have a few SBR’s with an additional non NFA upper for each (14.5, 16", 18") when I want to reach out and or a larger optic on them for distance.
There is a hypothetical constructive intent situation you’ll want to avoid, something a more knowledgeable member can detail as I’m not 100% sure. The gist is you shouldn’t own extra non-nfa lowers additional to registered one if you have extra NFA uppers. Otherwise shoot on.
That’s true but not what I was asking. I know I can temporarily swap any upper onto the registered lower.
What I meant is, am I allowed to sell/trade the upper that is the basis for my registered barrel length and OAL on the Form 1? In other words completely get rid of the 10.3” MK18 upper and trade it for something like an 11.5” 6933 upper?
If I remember correctly, that section of the form references “permanent change “. What constitutes a permanent change? If you sell an upper with a specific barrel length does that mean you could never purchase another with an identical barrel length? I think the section references minutia that I wouldn’t worry yourself about. If it makes you feel better on a SBR I built, I didn’t even buy a barrel of the same length I put down on the form.
It’s been a few years since I’ve SBR’d a rifle but if memory serves, as you said you can always put on a barrel longer than what is on the form 1 but cannot go shorter than what was applied for.
You can sell your 10.3" upper anytime you want & can replace with anything you want as long as the new upper is not shorter than the 10.3" you have on your form 1.
If you wanted to, you could always notify the ATF of a permanent change. I wouldn’t bother, although I chose common and reasonable lengths that I will likely always have laying around on my forms. For the love of all that is unholy, though, please don’t ask the AFT to clarify anything.
Nothing is really all that permanent on an AR. For example, cranking a flash hider on a 14.5” gun with the biggest wrench you have and some red permanent Loctite doesn’t make a 16”. You have to weld it. So, being able to buy another 10.3” whenever you feel like it and make the gun back to whatever length is on the form via either two pins, or a couple wrenches, is probably close enough to “not permanent”.
I am definitely not a lawyer. I don’t even look like one.
Not a lawyer, not telling you to break any laws.
That said, you know nobody is ever gonna care right. You paids yor monies and you got your hall pass. Unless you get nailed for some heinous shit, no one is ever gonna even ask. Like others have said, “define permanent”. So you sold your 10.3 for “x” reason. Now you are just waiting to find an original NOS Colt 10.3 Crane spec NIB for a good price.
Probably gonna be a hell of a wait, but you are a patient man. 
I do not believe this is correct. I’ve never seen anything in writing from the ATF or a knowledgeable source stating such. AFAIK, a rifle is either an SBR or it isn’t. One isn’t more of an SBR than another.
So this is my “opinion” based upon decades of working with ATF.
If you have 1 SBR, you can have as many uppers as you want. You can have a dozen. The gray area seems to be having multiple short uppers and some other unmounted lowers. So if you have 1 SBR and a dozen LE6920s and other complete ARs you are fine. If you have a dozen short uppers hand half a dozen M4 (6920) lowers ATF might look at you sideways.
As far as changing the stated configuration, if you go from 10.3 to 12.5 and you are going to get rid of the 10.3 upper then just update your Form 1/4. Otherwise I’d keep the 10.3 just so you have a registered configuration that is current with ATF. NFA branch is usually pretty cool and pretty informed, they aren’t the door kicker type HOWEVER they like for all the records to be correct and current which really isn’t a lot to ask.
They really couldn’t care if your SBR is 10.3, 7.5, 12.5 or whatever, but WILLFUL non compliance does bother them. If you are going to own an SBR it comes with a certain level of responsibility and a stated correct configuration is one of them.
Personally, uppers don’t have tons of resale value and you are probably gonna lose every time you sell one so if you have a 10.3 (especially if it’s from a quality manufacturer like Colt, BCM, etc.) I would just retain it and have a selection of uppers that you feel you need.
How do you update a form 1? I will need to do that.
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I do not believe this is correct. I’ve never seen anything in writing from the ATF or a knowledgeable source stating such. AFAIK, a rifle is either an SBR or it isn’t. One isn’t more of an SBR than another.
You may be correct. As I said it’s been a few years (about 15) since I’ve had any involvement in sbr’ing a rifle.
This is my understanding as well. I too am not a lawyer but i did alot of searching before filing my form 1 and i just put down the shortest length that i had. I do keep mine in that configuration but i have thought about buying a 12.5 to shoot on it too. I would just say that honestly no one is going to care but then again i understand where you are coming from with the vagueness of the NFA laws and a criminal about to take over that agency.
A lot of questions can be answered here: National Firearms Act Handbook
To answer the original question: No, you are not married to the original configuration. It is never a bad idea to ‘make’ the firearm in the exact configuration that has been approved as that removes all doubt as to your intent because you meet any/all of the conditions of the relevant laws/registration requirements. There are a LOT of people who don’t do that, however, and they haven’t had any issues at all…and they won’t.
There is a lot of confusion about what/when the ATF NFA Division must be notified about things related to NFA firearms…and most of the confusion is due to the ATF itself.
Example: If you read the minutia on the Form 1/4, in the “Important Information for Currently Registered Firearms” section, it reads in relevant part:
Change of Description or Address: The registrant shall notify the NFA Division, Bureau of Alcohol, Tobacco, Firearms and Explosives, 244 Needy Road, Martinsburg, WV 25405, in writing, of any change to the description of the firearm in item 4, or any change to the address of the registrant. Notice the “shall”.
OTOH…
In numerous formal written opinions and FAQ postings on its website, ATF explicitly states that the “notification” is purely voluntary - most especially notifying ATF should the firearm be “removed from the NFA list” (e.g., the configuration is “permanently” changed to a configuration that is not regulated by the NFA - such as disposing of a short-barreled upper and ‘permanently’ attaching a non-NFA upper on an AR). Also, if you have a REALLY slow day and want to read the relevant laws, there is no requirement in the law that you notify ATF about anything once you are legal.
As with many things in life, if there is confusion - especially on something that could result in a federal felony prosecution - compliance with the most restrictive guidance - even if not definitively mandatory - is never a bad idea. All it takes is a quick letter to the NFA division should you move and/or make a change to the registered configuration that a reasonable person would think is ‘permanent’. Do that and regardless of what is said anywhere else by anyone else, you are definitively in compliance, and not only will you not have any issues, you CAN’T have any!
If you want to be contrary and/or obstinate and not do any notifications, that seems quite alright as well. No one is going around knocking on doors verifying compliance with the black-letter laws, rules, and/or regulations. Plus, for lots of reasons, no one is going to.
There is some incorrect info in the thread, but it has generally been corrected by others.
Example: An SBR is an SBR and the SBR barrel length is irrelevant (e.g., you can go shorter than the registered configuration without issue. See the comments above about notifying the NFA Division after a ‘permanent’ configuration change).
There is also great information presented in a good way.
Example: the comment about “constructive intent” being hypothetical.
If ‘constructive intent’ is the great boogeyman that a lot of people seem to think it is, no one could ever be in possession of both a ‘regular’ rifle or shotgun and a functional hacksaw and every gunshop in the country that had AR-based pistols in their racks with carbine buffer tubes and stocks that would fit those tubes on their shelves would be closed within days and every employee on the premises prosecuted. Clearly, that doesn’t happen.
In my many years of involvement in these matters as an LEO, I am not aware of a single prosecution for “constructive intent”, and only a handful of voluntary forfeitures in the few cases where ‘constructive intent’ could have been a viable argument. “Constructive Intent” is a fun talking point but it is essentially a non-issue. The way to avoid even the remotest possibility of it is really, really simple: Have a way to assemble every component you possess into a legal configuration at all times. Do that and even the idea of constructive intent is completely irrelevant.
FTR, even if you land on the wrong side of the NFA due to misunderstandings or confusion, prosecutions of individuals for NFA violations are actually extremely rare. One-time violations are essentially NEVER prosecuted unless there are other extraordinary reasons (e.g., a notorious drug dealer in possession of an unregistered machinegun being the sole example I am personally aware of where a non-licensee was prosecuted).
Typically, when an NFA violation is suspected, there is a cursory investigation - NFA violations aren’t exactly difficult to prove - followed quickly by an offer to have the possessor voluntarily forfeit the firearm in question. It’s a pretty straight-forward offer - either forfeit the thing in an agreement for ATF to not prosecute or they will bring the weight of the entire federal criminal justice system down upon your head like the waves of the ocean crashing upon the shore during a hurricane…and this is a one-time offer…and you need to pick one, right now.
Smart people know what to do and it all goes away with a stroke of a pen and the firearm you were likely never going to get back anyway eventually being turned into a manhole cover or similar when it is sold as scrap after it was chop-sawed into multiple pieces.
Hope this helps,
MJN1957
Should be more or less the same as a Form 4.