AR-15 SBR Questions

[Titanmax]

I have recently received approval from the ATF for an AR-15 SBR. I understand the 29" OAL rule but have a few questions.

1. Does a 10.5" barrel chambered in 5.56 need to be marked, or advertised, as HBAR? Can't say I've ever seen one marked as such.
2. Can I change out the upper to other calibers, say 300Blackout or .22LR, without filing additional paperwork with the ATF? Keeping it over 29" of course.
3. Can I install a verticle forgrip on a SBR that is 29" OAL

 

[outrider58]

1. No

2. Yes, you may add as many uppers you want as long as you keep the original caliber. If you decide you want to permanently change the caliber, I believe you are supposed to notify ATF of the permanent change.

3. Yes

 

[Titanmax]

outrider58, Thanks for the quick response.

 

[OP and D since MCMLXXV!]

Have got a silly question. PM sent. Thank you.

 

[Squaregrouper]

1. No

2. Yes, you may add as many uppers you want as long as you keep the original caliber. If you decide you want to permanently change the caliber, I believe you are supposed to notify ATF of the permanent change.

3. Yes

My AR SBR was built as a 5.56mm. It has had a .300AAC upper on it since a week or two after getting the stamp. I now have an 8.5" 5.56 upper that does absolutely nothing, but I have to keep it in order to remain legal.

 

[outrider58]

My AR SBR was built as a 5.56mm. It has had a .300AAC upper on it since a week or two after getting the stamp. I now have an 8.5" 5.56 upper that does absolutely nothing, but I have to keep it in order to remain legal.

Changing Your SBR Upper with a Different Caliber Than the Registered L

Changing your SBR upper with a different caliber than the registered lower is possible. Since you can't use "multi" caliber on the ATF Form 1 application anymore, many people ask us. Can I change the upper caliber on my registered [tax stamped] lower SBR? The answer is yes. There a few ways...

www.nationalguntrusts.com

 

[brianns]

Can you put more than one caliber on the form as long as you are not using the word ‘multiple’?

 

[outrider58]

Can you put more than one caliber on the form as long as you are not using the word ‘multiple’?

As far as I know, there is no need to. Unless the law has changed, you can put any upper on your SBR you like, even a shorter than 29"(OAL) rim fire. As long as you can readily return it to its registered caliber, you are GTG.

Dd you know, if you put an over 16" upper on an SBR, it ceases being an SBR for the duration of the new coupling?

 

[brianns]

As far as I know, there is no need to. Unless the law has changed, you can put any upper on your SBR you like, even a shorter than 29"(OAL) rim fire. As long as you can readily return it to its registered caliber, you are GTG.

Dd you know, if you put an over 16" upper on an SBR, it ceases being an SBR for the duration of the new coupling?

That's good if it's not needed. But that 2nd thing I did not know. Sounds like one would then have to put on a heavy barrel if it's 5.56 or 5.56 AR.

My Uzi clone has 3 calibers marked on the upper part and the Form 4 has the same on it. Made me wonder about the discussion above.

 

[outrider58]

That's good if it's not needed. But that 2nd thing I did not know. Sounds like one would then have to put on a heavy barrel if it's 5.56 or 5.56 AR.

My Uzi clone has 3 calibers marked on the upper part and the Form 4 has the same on it. Made me wonder about the discussion above.

On the Hbar part, I'm not sure, but logic would dictate, if the SBR was built before the 2013 ban, it would not have to have a heavy barrel. The build date of an SBR marks its birth date, and thereby have to adhere to the laws of that era.

I'm not clear on the "multi" discussion. To my shady recollection, form1s for AR lowers(for example), though marked "multi" still required a registered caliber. It's been some time since I did one though, so...

 

[DocPeanut]

I'm not clear on the "multi" discussion. To my shady recollection, form1s for AR lowers(for example), though marked "multi" still required a registered caliber. It's been some time since I did one though, so...

That is correct, they ask for the caliber on a form 1 multi cal lower

 

[outrider58]

That is correct, they ask for the caliber on a form 1 multi cal lower

Thanks Doc!

 

[Worsley]

Changing Your SBR Upper with a Different Caliber Than the Registered L

Changing your SBR upper with a different caliber than the registered lower is possible. Since you can't use "multi" caliber on the ATF Form 1 application anymore, many people ask us. Can I change the upper caliber on my registered [tax stamped] lower SBR? The answer is yes. There a few ways...

www.nationalguntrusts.com

I have it on good authority that the ATF will not charge you if you change from 5.56 to another caliber... They much rather you not use bullets that explode inside of people... Now if you change from another caliber to 5.56, then your f_cked!

 

[DocPeanut]

Thanks Doc!

It’s the least I can do

 

[Growler215]

I keep an SBA4 brace on one of my SBR lowers. Tax stamp was registered with a 12.5" 350 Legend upper, but keeping a brace on it keeps it MD legal with my 8.5" uppers, which don't make 29" with any reasonable length stock.

 

[brianns]

On the Hbar part, I'm not sure, but logic would dictate, if the SBR was built before the 2013 ban, it would not have to have a heavy barrel. The build date of an SBR marks its birth date, and thereby have to adhere to the laws of that era.

I'm not clear on the "multi" discussion. To my shady recollection, form1s for AR lowers(for example), though marked "multi" still required a registered caliber. It's been some time since I did one though, so...

That's me thinking ahead since I don't have any SBRs. It would be from now until later laws.

Seems like the Group Industries/Vector guys built the Uzi Clones under the older laws. That was sort of a selling point or something pointed out to me when I was checking it out before buying. "These guys made these for 3 different calibers..." (9mm, 45 acp and 22lr)

 

[Bafflingbs]

That's me thinking ahead since I don't have any SBRs. It would be from now until later laws.

Seems like the Group Industries/Vector guys built the Uzi Clones under the older laws. That was sort of a selling point or something pointed out to me when I was checking it out before buying. "These guys made these for 3 different calibers..." (9mm, 45 acp and 22lr)

Uzi’s are pistols, I believe. They shouldn’t fall under SBR’s, as far as I know. Check the State Police website, to see if that particular model is on the MD State Police Handgun registry.

 

[outrider58]

I have it on good authority that the ATF will not charge you if you change from 5.56 to another caliber... They much rather you not use bullets that explode inside of people... Now if you change from another caliber to 5.56, then your f_cked!

Why is that(the f_cked part)?

 

[Biggfoot44]

Dd you know, if you put an over 16" upper on an SBR, it ceases being an SBR for the duration of the new coupling?

Assuming that the 16 inch bbl puts it over 26 in OAL .

( Yeah I know , Maryland. But some of have Grandfathered SBR , or might be swapping uppers while out of state . )

 

[outrider58]

Uzi’s are pistols, I believe. They shouldn’t fall under SBR’s, as far as I know. Check the State Police website, to see if that particular model is on the MD State Police Handgun registry.

Plus, since we are talking about a select fire NFA item(I assume), SBR regs do not apply.