Can I Register A Multi Calibur Nfa Lower?

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I recently "built" a Colt Commando pistol and am planning on sending in my Class ane with the $200 tax to SBR this lower and not worry virtually the ever irresolute AR Pistol laws.
I finished this ane with a factory new Filly M4 Carbine lower receiver and swapped out parts for a SB Tactical SBA3 caryatid, Geissele SD-3G trigger, Geissele Super 42 H2 buffer and braided jump. For the upper I started with a manufacturing plant new Colt 6933 Commando eleven.5" upper and added a BCM Gunfighter Mod iii charging handle and Midwest Industries MI-20M drib in 2 slice free float M Lok handguard.

I have another pistol upper I recently put together in 6.eight SPC on a lower that is marked "multi cal."
This is where my question comes in. I was under the assumption that one time I have a SBR registered lower I can pin practically any upper onto it I want, and then long every bit the caliber of the upper matches the caliber engraving on the lower. Is that correct, and if and so, can the "multi cal." lower take any caliber upper on it? If that's not the case, can I Form 1 my five.56 marked Colt and run my 6.8 upper on information technology if I wanted?

Thanks in advance

Cory
Quotient doesn't matter either, regardless of what's on the Course 1 or stamped on the lower.
The but thing you don't desire to do is not be able to configure it equally it'due south listed on the Form 1. And so if you Form 1 it as a 10.v" five.56, exist sure to keep a 10.5" 5.56 upper on hand, or send a letter in amending it to whatever configuration you'll exist able to produce.
That makes perfect sense now, cheers. I've had locals tell me it doesnt matter what upper you run but nobody ever mentioned the fact you need to keep a/the like upper on mitt the lower was originally registered for. I recall it'd be a proficient idea to bring that upper to the range if i programme on shooting a different upper and then too.
Certainly have that other upper handy. And I would feel better with the "multi" marked upper only considering some cops don't know the laws that they are trying to enforce and that can cause headaches. "Multi" would immediately be an indication that it's ok to swap barrels.
As the others have said, it doesn't really thing what caliber the lower is marked. I suppose that if yous're going to be swapping uppers in different calibers, the "multi" marking is the way to go.
I have the opposite trouble. If I'm going to build a rifle in, say, 5.56 mm, I want the lower receiver to say "v.56 mm." I'1000 just picky that way. Only most stripped lower receivers on the market place are in fact marked "multi." It's tough to find lowers these days with specific caliber markings. Especially anything other than 5.56 mm.
Eh, I wouldn't trouble yourself if y'all don't plan to run that upper. Just brand sure you can legitimately tell whatsoever inquiring BATF agent that the upper listed is at habitation.
I've been in the NFA game for awhile, routinely demonstrating a half dozen or more than suppressors on SBRs and auto guns. Know how many times I've been asked to produce documentation? Nothing. I go on photos of all Grade one, 2, 3 or iv on my phone just in instance, but never needed to show them.
I've never been asked to bear witness my documentation to anyone either.
That part kinda annoys me. I got mine set up upward for .300 on this specific upper I don't now like so either I demand to just go along it and not worry, or get an identical higher quality clone.
So my advice: pick a good upper y'all will want forever to practise the Form 1 on.
Did you skip the terminal judgement? If you permanently change the configuration, just ship in a letter amending the F1 info.
I as well don't know anyone who has, or know for certain anyone who has, but I keep all my photocopied docs in a red nylon envelope with the gun considering who knows.
It'southward pretty much incommunicable to make a permanent alter to an AR.
In other words at that place volition never be a need to notify ATF of any change to caliber, OAL, bbl length, etc.
I know, that'due south why "annoyed" not "kills me," or "ruins my gun." But the .300 upper is just in the rubber waiting to be improved or traded out while I mostly run the nine or five.56 upper on it.
I know it's just more paperwork to submit, keep track of etc., wish I had been a tiny bit less impulsive equally I wouldn't have to practice that, and keep rail of it.
If you switch out the upper on your SBR to a different caliber or butt length, in that location is no law or regulation requiring you to maintain the original upper or to notify the ATF of your change. What MachIVshooter is saying is simply a recommendation, since the ATF requests that y'all notify them of any permanent changes to caliber or length. And y'all certainly don't need to bring your unused original upper to the range with you; the only reason to do so would be if you lot're worried about coming into contact with overzealous and uninformed LEOs. But like others in this thread, I've never once been asked for my NFA paperwork, even when I've come up into contact with police officers while out shooting my NFA stuff in the woods.
All skillful points guys. I think I'll Class ane my 556 Filly lower instead of the "multi" Aero ane, then I can keep the Filly Commando with matching receivers.
Basically, I should exist safe keeping copies of the documents with me at the range. There is typically nobody at the range I shoot at anyhow so I'm not terribly worried about it anyway.

Now is it truthful that once you have a registered SBR that the ATF tin come do a checkup at your house whenever they want, or is that all hearsay?
zeke Member

Joined:

Dec 29, 2002

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697

Location:

NW Wi
And so if you have a registered sbr for 12 inches and desire to notify in a letter to ATF permanently modifying it to 10 inches, does ATF officially respond in some format? Or practice they simply proceed the letter in case someone calls them up?
Thanks
Paying a revenue enhancement (which is what an NFA stamp is) does not forfeit your fourth amendment rights regarding searches.
I only know one guy that has been asked. One time it was retrieved he said information technology was similar they didn't know what they were looking at anyhow.
Who was "they"? Local LE?
I form 1ed my "multi" lower as a 9.5" 5.56 SBR. I have since had it rebarreled every bit an xi.three" .300 Blackout. I just kept the old barrel so if the ATF ever wants to see it I can prove that it tin be put back into it's original configuration. In that location is always the possibility I may take the money in the future for a separate complete upper for it. I thought about writing them, but no real reason to, so improve off just leaving them be, similar I want them to leave me be. As long equally you lot go by the rules, you're covered should they ever come for a look-come across.
One of the problems is that the alphabetic character of the law can make a mock-upwardly to get an accurate OAL illegal and you sometimes have to guess. When I first got into the NFA game I included the muzzle device in OAL (funny how removable stuff on i end counts but not the other). Too I measured ane shotgun of the same make earlier building my Lupara and constitute the ribs and vents were different on the second gun of the same model. I wanted to cease on a rib for structural and cosmetic reasons.
I sent a alphabetic character for both of them with corrections and got a simple acknowledgement in the post 3 years later. I would not practice so for a modular blazon firearm like an AR.

Mike