SBR procedure overview?

[RCCrawler]

However, if you ever want to rebuild your primary upper in a different length or caliber, it is just mailing to the ATF to inform them that the change has happened. There is no approval, or waiting. Just send it in and make your change, so it isn't as big of a deal as some make it out to be.

Hmm, I may have to look into that. I have an SBR I built as an 8"er that I'm really kicking my self I didn't build a little shorter. It'd be simple to just take it to Bert and have him re cut and thread the barrel, but I thought I'd have to resubmit.

[Great-Kazoo]

Hmm, I may have to look into that. I have an SBR I built as an 8"er that I'm really kicking my self I didn't build a little shorter. It'd be simple to just take it to Bert and have him re cut and thread the barrel, but I thought I'd have to resubmit.

I put all my SBR's as 7" bbls AND 5.56 This gives you leeway ( BBL and OAL )if you decided to drop a 22 or 9mm upper on. YMMV

[Great-Kazoo]

If you put multi on your Form 1, the BATFE will not approve your form.
If you put down more than one caliber on your Form 1, the BATFE will not approve your form.

So even if your lower says "MULTI", you put down the ONE caliber you first intend to build it in. The manufacturer can get away with marking receivers multi because they are produced as receivers only, so have no caliber until they are someday fitted with a barrel. An SBR must have a rifled barrel, so it must have a caliber, and the BATFE wants a description of the firearm as you will first build it.

^^ THIS^^^

[brutal]

Can I use multiple short barreled uppers on the SBRd lower? It requires a paperwork change?

I don't know that I care, just trying to understand.

As I understand it - Anything you want temporary. For a permanent change to the Form1 lower, you submit the change.

Here's one for the guru's. If you take it out of state on an approved form 5320.20, must it be the permanent upper on the form1 or can it be a temporary or even multiple uppers?

[Great-Kazoo]

As I understand it - Anything you want temporary. For a permanent change to the Form1 lower, you submit the change.

Here's one for the guru's. If you take it out of state on an approved form 5320.20, must it be the permanent upper on the form1 or can it be a temporary or even multiple uppers?

I've taken all/multiple uppers with me, but kept the Form 1 upper on the lower.

[RCCrawler]

I put all my SBR's as 7" bbls AND 5.56 This gives you leeway ( BBL and OAL )if you decided to drop a 22 or 9mm upper on. YMMV

That wouldn't have worked in either of my examples.

On one of mine it's built on a 15-22, I cut it to 8 not thinking that it takes less than 5.5" to keep most ammo subsonic, so I'd now like to cut 2.5" off of it. My understanding is I can go longer with no problem, but shorter and I have to fill out paperwork even if I keep this current upper on hand and buy another one.

Another one of mine is built on a DDLES dedicated 9mm lower with a 3" barrel.

[Eric P]

I that case you would put 300BLK on the form and engrave CAL 300blk on the lower. My lower was a factory "multi" and I engraved CAL 5.56 on it alomg with my trust name and city.

So on my form, I only put down 7.62 as the caliber. Will they kick the form back? Could be for 7.62x35 (300BLK) or 7.62x39

And do you have to engrave the caliber if it says multi?

[Great-Kazoo]

So on my form, I only put down 7.62 as the caliber. Will they kick the form back? Could be for 7.62x35 (300BLK) or 7.62x39

Why would they? You listed one caliber, not, Multi, 300 XXX .

If it is in pending status call them, have your serial # on hand, when they ask. Then see what they say. Only ATF will can you a definitive answer, depending how they feel, that day, maybe. Be sure you get name, date, time. This way IF there is an issue later on you have documentation to reply with.

[SA Friday]

Does anyone have any guidance, an actual ATF pamphlet or instruction, indicating that short of the SBR's original configuration the AFT gives two rat poops what upper is on the lower? The upper is just a part. The lower is the item being registered.

I have talked to the NFA ATF office about removing uppers from SBR's and turning them over to the owner while the Form 4 on the lower clears. I discussed the upper being used on a lower previously Form 1ed. They related flat out that the upper was just a part and the lower was relevant.

I will not even remotely shocked if it's erroneous. Equally, I will not be shocked if the last three strings of info are not supported by direct ATF guidance.


I'm not even sure the AFT even knows…..

[mtnrider]

So on my form, I only put down 7.62 as the caliber. Will they kick the form back? Could be for 7.62x35 (300BLK) or 7.62x39

And do you have to engrave the caliber if it says multi?

I would think 7.62 is just fine. Just like 5.56. I didn't put 5.56x45, I just put 5.56