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You don't have to buy a multi caliber lower. Once you do a Form 1, you are the manufacturer registering the caliber.
There are lowers marked 'Multi' not say 5.56 or .223 - this goes back to what the OP had a question about .... and a lower already marked Multi would not be restricted to just 'one' caliber...this is good for several reasons and more so seeing how ATFTB has wordsmith several other clarification letters most of the time just making things clear as mud ;)

Look - you want me to make your head spin... check this out - SilencerCo is releasing a new compact .45 suppressor and registered in that caliber only - you can change endcaps from .45 to 9mm - on a pistol suppressor that you can remove baffles ... this (again depending how you interpret law and what ATF says is a caliber change .... why you ask well because the endcap retains the baffles and thus by ATF is a caliber change + a silencer part...big NO NO.

Now you may argue well what about a rifle silencer in .30 caliber registered as such but I can change the endcap to 5.56? Well - by ATF that's ok because its not a caliber change of the suppressor (the guts cannot be removed) and the endcap is just that a endcap....not a silencer part...LMAO...your head hurting yet?
 

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Just make sure that the Form 4473 for the AR15 lower is marked "handgun" then you can do anything with it that you want if you follow the law. But once a "rifle" lower, always a "rifle" lower as far as AR15 lowers are concerned. Even if the 4473 is marked "handgun", if you build the lower into a "rifle", the lower is always considered a "rifle" under the law. How would they know, they would not unless they get their hands on it if it is a rifle then again if it is a pistol. Not likely to happen, but it is the law and we are expected to follow the law no matter how stupid it is.
If it's a stripped lower, the 4473 is marked "other", unless your state has other rules. Also, a stripped lower can be built into an AR pistol, and then a rifle and back to a pistol. If it were built into a rifle first, then it would be a SBR if built with a barrel less than 16" or a pistol afterwards.
 

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There are lowers marked 'Multi' not say 5.56 or .223 - this goes back to what the OP had a question about .... and a lower already marked Multi would not be restricted to just 'one' caliber...this is good for several reasons and more so seeing how ATFTB has wordsmith several other clarification letters most of the time just making things clear as mud ;)
The thing is that you can register the lower as anything you want and then put another upper on it of a completely different length and caliber. It doesn't matter what the lower is marked.
 

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If it's a stripped lower, the 4473 is marked "other", unless your state has other rules. Also, a stripped lower can be built into an AR pistol, and then a rifle and back to a pistol. If it were built into a rifle first, then it would be a SBR if built with a barrel less than 16" or a pistol afterwards.
This was my understanding as well. It doesn't have to transferred as a pistol, just as a receiver (not rifle).
 

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Definitely a NO NO if you have other AR's, that would be constructive intent.

Not sure, if the AR SBR is the only AR you have. There have been different OPINION'S in regards to that.
Simply not true, you can have as many short uppers as you want, it also doesn't matter what barrel length (or caliber) is on the original form 1 (or form 4 for factory SBR lower). Doesn't matter if you have non NFA lowers & uppers as well. This is common practice.
 

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