Where can I buy a folding stock for a Sig 556 pistol?


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TechPrepper
June 14, 2011, 06:19 PM
I recently purchased a Sig-Sauer 556 Pistol and would like to put a stock on it. I've already filled out the paperwork and my FFL is processing it for me. What I need to know is where I can purchase a folding stock. Any suggestions?

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JustinJ
June 15, 2011, 10:00 AM
I would contact sig directly. If you haven't fired it yet and have access to a class III dealer you could return yours and but one with a stock already on it. Sig does make them.

rosewood151
June 15, 2011, 12:34 PM
If you bought the "556 Pistol" the rear of the gun should have come from the factory with just a vertical picatinny rail for attaching a sling. IIRC, for a manufacture to sellthe gun as a "pistol" they had to remachine it so it COULDN'T accept a stock. (I could be mistaken, I'm at work and can't do a real thorough search.)

MasterSergeantA
June 15, 2011, 12:42 PM
First...do NOT buy the stock until you have the approved Form 1 in hand. If you simply must buy it because fo a great deal or something, store it somewhere away from the pistol until the paperwork comes back. Possession of both items in the same place (safe, gun room, etc.) can be construed as 'constructive possession' by the ATF. Are you likely to get busted for that? Probably not, but I tend not to create jeopardy where there is no need.

As to the stock, if you remove the round plug in the back of the receiver, virtually any AR type stock can be used. ACE stocks offers folding versions specifically for the SIG 556, but there are other adapters that will work as well. Nordic Components offers a collapsible wire stock similar to those on the old M3 greaseguns that I have on a 10/22 and have considered using on the 556 since it requires no buffer tube. If you google 'SIG 556P SBR', you will get a number of hits on various boards that will offer options for your build. Getting the plug out of the receiver varies in difficulty from easy to ^&%$#*@ hard depending on how much loctite the guy building your pistol decided to use that day. The board discussions dwell on this a bit.

Another option is to purchase the entire lower from SIG or a secondary market source. It will run a bit more money, but you can easily swap back to pistol configuration (a legal conversion, should you wonder) without much hassle. That was the route I took. Since the upper on the SIG is the serialized part unlike the AR, buying another lower is just like buying a scope or grip. There is one currently for sale on www.sturmgewehr.com.

And I forgot that you could also buy just the folding stock that SIG offered on the original pistols. It is an AR pattern stock, but manufactured (or contracted out) and marked by SIG for the rifles. They were scarce and expensive for a while until the "Classic" model was introduced using the old 551 profile. I actually have one of the SIG stock adapters floating around the garage somewhere.

Hope this helps.

MasterSergeantA
June 15, 2011, 12:47 PM
And as an OBTW, you don't need a dealer to process your paperwork unless you are attempting to BUY the SBR. If you are MAKING it yourself, the paperwork is between you and the ATF. If the dealer is a good guy and is helping you, that is great. I help customers in our shop all the time since we don't have the SOT/FFL. You can get most of what you need online except the fingerprint cards and you can order them from ATF for free.

Mudinyeri
June 15, 2011, 01:37 PM
Get the Form 1 and then do a Google search on "P556 SBR". You'll find a ton of information about SIG P556 SBR conversions, including folding stock options.

I know you've already filed the SBR paperwork, but you might consider an URBAN-ERT P556 sling. It's not quite as stable as having a stock, but it'll save you the $200 tax stamp and engraving.

TechPrepper
June 16, 2011, 11:56 AM
Thank you all for the great information. Just what I was looking for!



And as an OBTW, you don't need a dealer to process your paperwork unless you are attempting to BUY the SBR.

I'm picking up 2 silencers at the same time so he's willing to add this to the list of paperwork.

First...do NOT buy the stock until you have the approved Form 1 in hand.

Understood.

As to the stock, if you remove the round plug in the back of the receiver, virtually any AR type stock can be used.

I guess that since I also have an AR-15 that is NOT an SBR, I could easily justify having a Magpul stock as being for that weapon until the paperwork comes through (Assuming I don't get a folding adapter and just use the regular AR stock)

I know you've already filed the SBR paperwork, but you might consider an URBAN-ERT P556 sling. It's not quite as stable as having a stock, but it'll save you the $200 tax stamp and engraving.

Very good advise. At the very least it would give me something legal to use until the paperwork is processed. I understand it can take several months.

MasterSergeantA
June 16, 2011, 01:42 PM
You are most welcome, of course. We are all happy to help.

On the issue of the stock, you could own a spare for your AR without raising anyone's eyebrows, I think. You could even probably acquire the folding mechanism as I have two ARs that don't use a rear buffer. The sticking point will be removing the plug from the SIG. Don't...until you have the Form 1 in hand. It will come out easily or not very easily or somewhere in between. Some require the application of a little heat for a few minutes; others screw out very easily.

Good luck and let us know how the build turns out.

onetusk
July 6, 2011, 10:33 AM
First...do NOT buy the stock until you have the approved Form 1 in hand. If you simply must buy it because fo a great deal or something, store it somewhere away from the pistol until the paperwork comes back. Possession of both items in the same place (safe, gun room, etc.) can be construed as 'constructive possession' by the ATF. Are you likely to get busted for that? Probably not, but I tend not to create jeopardy where there is no need.

As to the stock, if you remove the round plug in the back of the receiver, virtually any AR type stock can be used. ACE stocks offers folding versions specifically for the SIG 556, but there are other adapters that will work as well. Nordic Components offers a collapsible wire stock similar to those on the old M3 greaseguns that I have on a 10/22 and have considered using on the 556 since it requires no buffer tube. If you google 'SIG 556P SBR', you will get a number of hits on various boards that will offer options for your build. Getting the plug out of the receiver varies in difficulty from easy to ^&%$#*@ hard depending on how much loctite the guy building your pistol decided to use that day. The board discussions dwell on this a bit.

Another option is to purchase the entire lower from SIG or a secondary market source. It will run a bit more money, but you can easily swap back to pistol configuration (a legal conversion, should you wonder) without much hassle. That was the route I took. Since the upper on the SIG is the serialized part unlike the AR, buying another lower is just like buying a scope or grip. There is one currently for sale on www.sturmgewehr.com.

And I forgot that you could also buy just the folding stock that SIG offered on the original pistols. It is an AR pattern stock, but manufactured (or contracted out) and marked by SIG for the rifles. They were scarce and expensive for a while until the "Classic" model was introduced using the old 551 profile. I actually have one of the SIG stock adapters floating around the garage somewhere.

Hope this helps.
are you saying that with a new lower i would not need to do ATF paperwork?

TechPrepper
July 6, 2011, 03:45 PM
are you saying that with a new lower i would not need to do ATF paperwork?
Good question ... I would imagine so. It doesn't seem to matter where or how you shorten the weapon if at the end of the day it is less that 16" you have created an SBR. Am I missing something?

MasterSergeantA
July 6, 2011, 06:09 PM
Sorry for the confusion. Yes, you need to do the ATF paperwork...unless you care to spend some time in federal custody. Putting the folding stock lower on the pistol upper creates a short-barreled rifle (SBR). Making such a firearm requires an approved Form 1 from the ATF. There is a tax of $200 associated with 'making' a SBR and the same amount applies to transferring an existing SBR to a buyer, but is done on a Form 4. The tax is a one-time thing per owner. A lot of folks prefer to have the SBR 'made' by a manufacturer licensed to do such things and then pay the transfer tax (Form 4) instead of doing it themselves. I put "making" in single quotes because the conversion can be accomplished with the simple act of pushing out the pins, switching lowers, and pushing the pins back in. But doing so without the approved Form 1 creates problems.

Any rifle with a barrel length of less than 16" and/or overall length of 26" is defined as a short-barreled rifle. Overall length is measured between the extreme ends of the gun, along a centerline which passes through the middle of the barrel. For rifles fitted with folding or telescoping stocks, US Federal guidelines state that measurement is made with the stock unfolded as intended for use as a rifle; exception is made for rifles with easily detachable shoulder stocks, which shall be measured with shoulder stock detached. Some states such as California measure overall length with the stock folded. Barrel length is measured from the end of the muzzle to the front of the breechface, typically by inserting a measuring rod into the barrel. Barrel length may partially comprise a permanently-attached muzzle accessory (such as a compensator or flash suppressor).

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