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Is it legal to use a 300 blackout upper on an sbr registered for 556, what about a 22lr where you are really only changing the magazine and the bolt carrier group?

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I am registering a 556 lower on a form 1. As this is my first ever build, I did this before I knew about 22lr conversions or 300 blackout. Is it legal to use a 300 blackout upper on an sbr registered for 556, what about a 22lr where you are really only changing the magazine and the bolt carrier group?

Also, for anyone interested, I checked a few days ago with the NFA regarding the timing of my form 1 - although I didn't ask this question. I was told that I would probably get the stamp for the form 1 I submitted in mid April in December.

If the BAFTE is monitoring this website. All I can say is that I love you so much. Thank you for giving me a wonderful Christmas present instead of distracting me during college football season.

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Last time I checked, you do need to register your SBR for barrel length and caliber.... you used not to have to.  Whoever said unless it is a permanent change... check that out.  No upper change on an AR is permanent so that makes no sense.   You can add amendments for separate calibers but you have to attach another form that states the other calibers that will be run on you SBR.  So to answer your question... NO it is not legal to run 300BLK on a 556 registered SBR lower.  Yea december sounds right if you just submitted it as an individual... typically it takes about half the time (2-3 months) if you submit the form under the name of a trust.  However, to get a solid trust (which needs to be solid) it is going to cost you close to 1k.  If you were planning on using other calibers on it you probably should have asked before you submitted the form.

Quoted:
Last time I checked, you do need to register your SBR for barrel length and caliber.... you used not to have to.  Whoever said unless it is a permanent change... check that out.  No upper change on an AR is permanent so that makes no sense.   You can add amendments for separate calibers but you have to attach another form that states the other calibers that will be run on you SBR.  So to answer your question... NO it is not legal to run 300BLK on a 556 registered SBR lower.  Yea december sounds right if you just submitted it as an individual... typically it takes about half the time (2-3 months) if you submit the form under the name of a trust.   However, to get a solid trust (which needs to be solid) it is going to cost you close to 1k.  If you were planning on using other calibers on it you probably should have asked before you submitted the form.

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Full of misinformation!!!!!!

First off, when a Form 1 is filed you put down the OAL, Caliber, Barrel Length, etc... That is the orginal configuration that you are going to manufacture the SBR to.  So after you manufacture your SBR, you can use any caliber upper you want on your lower, as long as you maintain the parts to put it back in the orginal configuration requirements.

Straight from the ATF website of FAQ on SBR
Q: If removal and destruction or disposition of the short barrel removes the firearm from the purview NFA, is there a minimum time period the barrel must remain unattached for the firearm to not be regulated under the NFA?
The temporary removal of the barrel for repair or change of caliber does not remove a NFA firearm from the purview of the NFA. If the registrant maintains control of the parts required for assembly of a SBR, he or she must maintain the registration as a SBS or SBS regardless of the length of time that the barrel is unattached.



Secondly it has been proven time and time again that using a trust is no faster than the indivual route and in some cases has taken longer.