[Kentak]

For those with experience, please.

I have a Sig MPX 9mm carbine, 16 in barrel. I have an itch to convert it to an SBR, and there is apparently a conversion kit available. The MPX is modular and designed for easy barrel and hand guard swapping.

What are the steps I have to follow and in what order to remain on the legal side of the process?

 

[SpringerTGO]

Decide what barrel length and stock you want. Do NOT buy those parts until the SBR is approved. Figure out the length of the Sig with that length barrel and stock. I had a lawyer make a trust for me, so I didn't have to supply finger prints and photos. The dealer I buy my NFA things from assists with the paperwork, and sent the paperwork along with $200 to the ATF. You could do that yourself, but if you miss a dot or don't cross a T you won't get approved.
Then wait. Then wait some more. And after more waiting your paperwork will be approved. You can then purchase and install your parts.

 

[intenseneal]

SBR tax stamp is BS. You can buld a pistol AR but need a tax stamp for a SBR. The pistol is smaller thqn a SBR. Good old Uncle Sam for you.

 

[cowboy1964]

Even with a trust you now have to do fingerprints and photos.

Just Google the topic, lots of good guides out there. You need up to date info.

 

[Kentak]

So, I would go to my local PD and ask to be fingerprinted on the required "forms?"

I perused a Form 4. It seems to be straightforward if you're buying an existing NFA firearm. It's more confusing to me when you have an existing non-NFA piece, like my MPX carbine, and want to convert by basically swapping barrels. The form asks for the name of the "transferor," the seller. Would that be the dealer that sold me the carbine, or the dealer that sells me the conversion kit? So confusing.

I guess I should go to my MPX dealer and see if they can help. It's the biggest gun dealer in my area, I assume they are NFA licensed, they do a lot of LE business.

 

[triggerjerk]

I think you want a form 1 since you are
technically manufacturing an sbr if you
are converting it yourself.

 

[Kentak]

I think you want a form 1 since you are
technically manufacturing an sbr if you
are converting it yourself.

The plot thickens.

 

[svtpwnz]

With the new 41f rules in place, my next SBR will be done as an individual vs trust. Local sheriff approval is no longer needed under new rules and they just get notified by the fed when you are approved.

Form 1 if you are building a SBR, finger prints, picture and send to BATF with $200 then wait about 4-6 months. Make sure the form 1 is filled out properly or it will get rejected. It's not really that diffacult but it's rediculous that we have to go through this BS to exercise our fundimental right.

Rules vary from state to state so make sure NFA is legal in you're state. We are GTG here in SC for anything NFA.

 

[Kentak]

Form 1 if you are building a SBR,

Thanks. So, is taking a currently owned rifle and swapping the long barrel to a short one considered "building" an SBR?

 

[svtpwnz]

Thanks. So, is taking a currently owned rifle and swapping the long barrel to a short one considered "building" an SBR?

Yes, it is. Anything less than 16" is considered an SBR unless you go with a 14.5" and have a 1.5 or larger FH pinned and welded. I'm building a Noveske Infidel currently and it has a 13.7" barrel. I'll be adding a Noveske KX5 FH pinned and welded by Adco to make it a legal 16".

Fill out the forms and get em in. Wait for you're stamp to come back and then buy you're barrel and swap it out. Do not put a short barrel on you're rifle til you have you're approved stamp in hand.

You could go the pistol route however, and change the buffer tube, then swap the barrel now. That way you can shoot it with a shorter barrel while you wait for the stamp. When the stamp comes in, swap in the rifle buffer tube and you're GTG.

 

[gooffeyguy]

What about serial # and engraving the frame with your info? If converting or building off an existing firearm, do you use the existing serial # and manufacture that's already stamped on it?

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[Gdirty5]

From the sounds of it, you already have an mpx RIFLE. In that case going from rifle to pistol is a no no, since when you bought it, it was sold as a rifle, so if you put a shorter barrel on it, it'll be a sbr even with a stupid "brace".

The process for a form 1 is straight forward, you fill out the form, as either an individual, trust or llc. You are the manufacturer, you will list the manufacturer of the rifle and serial that's on the gun. In your case, sig arms, model mpx, caliber 9mm. Then put your barrel length you want, and you will need to know your expected over all length. Write a check for 200 bucks and since we are lost 41p, you will also have to submit finger prints and photos of yourself and if filing as a trust or llc anyone else that's on the trust. They will keep it on record I believe two years. So if you build/buy more, you won't have to repeatedly send them in. AFTER, you get approved is the only time you are legally allowed to install parts to complete said sbr. General rule of thumb is to not have said parts on hand, but in reality, if it's boxed up and separated from the rifle, the likelyhood of an ATF agent asking to look in your house is slim to none. Also before you can "complete" this sbr, you will have to get the name of the trust if you go that route and city,state of manufacture engraved somewhere on the receiver.

 

[PEC-Memphis]

To get the SBR manufacturer's name/city/state engraving, I can highly recommend these folks: http://www.veritasmachiningllc.com/

Easy to deal with, and they do beautiful work.

 

[gooffeyguy]

So if you built an ar pistol using a PSA receiver then apply for the SBR stamp, you still need to have the city/state you live in engraved on it besides PSA's engraved info/city/state that's on it already?

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[svtpwnz]

So if you built an ar pistol using a PSA receiver then apply for the SBR stamp, you still need to have the city/state you live in engraved on it besides PSA's engraved info/city/state that's on it already?



Sent from my S7 using Tapatalk

Yes, also you're name if going under you or the trust name if you're going that route.

 

[Gdirty5]

Only way to get around the engraving is if you buy a factory assembled SBR. Which is available from certain manufacturers like DD, Sig, Spikes, Noveske, etc....

 

[PEC-Memphis]

Only way to get around the engraving is if you buy a factory assembled SBR. Which is available from certain manufacturers like DD, Sig, Spikes, Noveske, etc....

Yes, then you apply for the stamp on a Form 4 - rather than a Form 1.

 

[Gdirty5]

Believe it or not, call your local trophy shops. They engrave all the time. I use a guy and he does it while you wait.

 

[Chowser]

Make sure the trophy place can do the depth requirements to ATF standards.

Two sets of fingerprints and photographs with each form submission.

I got everything in before 41F took effect. We're switching to digital printing so I grabbed up a bunch of our leftover forms and an inkpad and will have a coworker fingerprint me if I decide to do anymore NFA stuff. ATF's got 14 stamps out of me already.

 

[Gdirty5]

Make sure the trophy place can do the depth requirements to ATF standards.

Two sets of fingerprints and photographs with each form submission.

I got everything in before 41F took effect. We're switching to digital printing so I grabbed up a bunch of our leftover forms and an inkpad and will have a coworker fingerprint me if I decide to do anymore NFA stuff. ATF's got 14 stamps out of me already.

I'm sure most places can handle .003" Considering a lot of the mail off engraving places do VERY shallow laser engravings. .003" is not much at all.