Anyone SBR a Sig 556 pistol?

Therapydude2 · February 7, 2009, 02:44 PM

I just picked up a new Sig 556 pistol and I want to SBR it. I have been through the process once with an AR, so I feel pretty comfortable as for what to do (regarding ATF Form 1). Just wondering what stock you all have put on this weapon. I'm leaning toward the Magpul UBR, but I'm just not sure if that would be the best choice. I don't really want a Sig side-folder. I would appreciate any input on this subject. Also, if anyone out there has put a Magpul UBR on a Sig 556 pistol, could you give me the overall weapon length with stock extended (not counting flash hider) for my form 1. Thanks!

DARIVS ARCHITECTVS · February 9, 2009, 11:05 PM

For Pete's sake, WHY ! ! ! ?

Therapydude2 · February 10, 2009, 04:14 PM

uhm, because it's as close as I'll ever get to a Sig 552?

Wildalaska · February 10, 2009, 04:17 PM

We have done several but none with the stock you mention

WildnicegunAlaska ™

aroundlsu · February 10, 2009, 06:20 PM

No one should ever ask "why" in a gun forum. Sounds a lot like politicians asking us why we "need" something. The guy wants to SBR a 556 pistol because it would be a cool thing to do. No other reason is necessary.

Now, back to topic.. I have seen a few 556s converted in the last few months. They look great but they have all been side folding stocks. In my opinion, the side folding stock is the best thing the platform has going for it.

Therapydude2 · February 10, 2009, 09:19 PM

I decided to go with the Magpul UBR for my stock. In the end, just couldn't go with a side-folder. I know the UBR is heavy, but the 556 pistol is front heavy, so maybe it will balance it out. To be honest, I just thought the UBR looked cool.

LFOD1776 · February 11, 2009, 10:23 PM

I completely understand why you went with the UBR for a 556 pistol SBR conversion. So... show us a pic or two!

Therapydude2 · February 11, 2009, 11:41 PM

With regard to pics, give me about 90 days. Just dropped my Form 1 in the mail on Monday. Needed to pick a stock so I could figure overall length for said form. Of course, after I get my stamp, I'll then have to find a UBR. Saw one on e-bay for about $400. Hopefully I can find one at a decent price when the time comes.

Tiger-Mule · April 23, 2009, 10:04 PM

I recieved my stamp on March 30th. I submitted the form 1 on Dec. 6th.

aroundlsu · April 24, 2009, 10:38 AM

That looks great!

jpoolsmyd2 · April 26, 2009, 10:54 AM

Great looking gun! I have always secretly wanted one of those. If you don't mind me asking, where did you pick yours up?

And I really like this:

Quote:

No one should ever ask "why" in a gun forum. Sounds a lot like politicians asking us why we "need" something.

True words. Very true.

KLRANGL · April 26, 2009, 11:24 AM

Wow, thats a very nice looking rifle. Dang it, another thing to add to the "when I get rich and famous" list... Hows it shoot?

1iviper · April 27, 2009, 04:25 AM

received my stamp back at the end of march

still waiting on the troy rail and a few other parts to finish it up

the ubr balances out the 556 nicely and fits the lines of the receiver pretty good.as soon as my ace folder gets here i'll be trying a ctr on it,if i like the folder i'll have a ubr for sale in the near future

gratuitous pics now

Willie Lowman · April 27, 2009, 10:53 AM

Now why did you have to do that to me? I promised my self I wouldn't buy any new rifles this year and you have to twist my arm and make me buy a Sig 556 pistol to SBR. Thanks jerk! Why are you making me do this?

gunnertwo · May 13, 2009, 02:42 PM

Newbie here. Question on the stock, is that the folder kit from SIG. Thanks...

G2

Yellowfin · May 14, 2009, 01:10 AM

That is just begging for you to put a can on it.

Tucker 1371 · May 14, 2009, 02:31 AM

I agree with Yellow, a can would finish that rifle up nicely

Quote:

Newbie here. Question on the stock, is that the folder kit from SIG. Thanks...

G2

Negative G2, that's a UBR stock from MagPul

gunnertwo · May 15, 2009, 12:28 AM

Thanks Tiger-Mule for the info. That's the way I'm headed.

G2

Therapydude2 · May 21, 2009, 07:36 PM

Found out my Form 1 was approved today (5/21/09)! Now just have to wait anxiously by the mail box.

PTK · May 22, 2009, 07:00 AM

That pair of SBRs is beautiful. The AR is a 10.5", yes? What brand?

NukeLabTech · May 28, 2009, 11:44 AM

I have SBR'd a 556 pistol and used the CTR stock.

1iviper · May 30, 2009, 03:58 PM

thank you

the ar is a tactical innovations lower and lmt 10.5 upper.

i've also removed the ubr from the sig and replaced it with an ace folder and ctr.still waiting on the troy rail and a front sight.

and here is a pic of my .50 beo sbr

Ironsights · June 28, 2009, 06:52 PM

Brand new to this. I have questions about putting a folding stock on a Sig 556 pistol.

drkpac · May 25, 2010, 05:16 PM

Yes...I'm looking to do the same thing to the 556 pistol. In fact, in addition to the folding stock, I'd like to throw on a quad rail so I can attach a vertical grip. Basically, I want to turn this thing into a bullpup carbine...is that too much to ask?? By the way, does anyone know if the barrel is threaded after taking off the muzzle brake? It'd be kinda cool to hook it up with a sound suppressor.

wackendogs · May 26, 2010, 06:04 PM

I made mine into an SBR. Best thing I could have done with it. I have other Ar15 SBR's but my Sig is the one I use the most.. One think I did notice is its not much quieter with my suppressor on.

February 7, 2009, 02:44 PM	#1
Therapydude2 Member Join Date: June 3, 2007 Posts: 19	Anyone SBR a Sig 556 pistol? I just picked up a new Sig 556 pistol and I want to SBR it. I have been through the process once with an AR, so I feel pretty comfortable as for what to do (regarding ATF Form 1). Just wondering what stock you all have put on this weapon. I'm leaning toward the Magpul UBR, but I'm just not sure if that would be the best choice. I don't really want a Sig side-folder. I would appreciate any input on this subject. Also, if anyone out there has put a Magpul UBR on a Sig 556 pistol, could you give me the overall weapon length with stock extended (not counting flash hider) for my form 1. Thanks!

February 11, 2009, 10:23 PM	#7
LFOD1776 Senior Member Join Date: November 20, 2006 Location: Texas Posts: 127	I completely understand why you went with the UBR for a 556 pistol SBR conversion. So... show us a pic or two! __________________ NRA Life Member

April 26, 2009, 11:24 AM	#12
KLRANGL Senior Member Join Date: September 9, 2008 Location: Fredericksburg, VA Posts: 958	Wow, thats a very nice looking rifle. Dang it, another thing to add to the "when I get rich and famous" list... Hows it shoot? __________________ And it's Killer Angel... as in the book

April 27, 2009, 10:53 AM	#14
Willie Lowman Senior Member Join Date: March 5, 2009 Location: Uh-Hi-O Posts: 3,006	Now why did you have to do that to me? I promised my self I wouldn't buy any new rifles this year and you have to twist my arm and make me buy a Sig 556 pistol to SBR. Thanks jerk! Why are you making me do this? __________________ "9mm has a very long history of being a pointy little bullet moving quickly" --Sevens

May 14, 2009, 01:10 AM	#16
Yellowfin Senior Member Join Date: January 7, 2007 Location: Lancaster Co, PA Posts: 2,311	That is just begging for you to put a can on it. __________________ Students for Concealed Carry on Campus http://www.concealedcampus.org "You can't stop insane people from doing insane things by passing insane laws--that's insane!" - Penn Jillette

February 9, 2009, 11:05 PM	#2
DARIVS ARCHITECTVS Member Join Date: November 29, 2004 Location: Minnesota, USA Posts: 43	For Pete's sake, WHY ! ! ! ?

February 10, 2009, 04:14 PM	#3
Therapydude2 Member Join Date: June 3, 2007 Posts: 19	uhm, because it's as close as I'll ever get to a Sig 552?

February 10, 2009, 04:17 PM	#4
Wildalaska Junior member Join Date: November 25, 2002 Location: In my own little weird world in Anchorage, Alaska Posts: 14,172	We have done several but none with the stock you mention WildnicegunAlaska ™

February 10, 2009, 06:20 PM	#5
aroundlsu Senior Member Join Date: December 7, 2007 Location: Louisiana Posts: 156	No one should ever ask "why" in a gun forum. Sounds a lot like politicians asking us why we "need" something. The guy wants to SBR a 556 pistol because it would be a cool thing to do. No other reason is necessary. Now, back to topic.. I have seen a few 556s converted in the last few months. They look great but they have all been side folding stocks. In my opinion, the side folding stock is the best thing the platform has going for it.

February 10, 2009, 09:19 PM	#6
Therapydude2 Member Join Date: June 3, 2007 Posts: 19	I decided to go with the Magpul UBR for my stock. In the end, just couldn't go with a side-folder. I know the UBR is heavy, but the 556 pistol is front heavy, so maybe it will balance it out. To be honest, I just thought the UBR looked cool.

February 11, 2009, 11:41 PM	#8
Therapydude2 Member Join Date: June 3, 2007 Posts: 19	With regard to pics, give me about 90 days. Just dropped my Form 1 in the mail on Monday. Needed to pick a stock so I could figure overall length for said form. Of course, after I get my stamp, I'll then have to find a UBR. Saw one on e-bay for about $400. Hopefully I can find one at a decent price when the time comes.

April 24, 2009, 10:38 AM	#10
aroundlsu Senior Member Join Date: December 7, 2007 Location: Louisiana Posts: 156	That looks great!

April 27, 2009, 04:25 AM	#13
1iviper Junior Member Join Date: April 10, 2005 Location: NoVa Posts: 13	received my stamp back at the end of march still waiting on the troy rail and a few other parts to finish it up the ubr balances out the 556 nicely and fits the lines of the receiver pretty good.as soon as my ace folder gets here i'll be trying a ctr on it,if i like the folder i'll have a ubr for sale in the near future gratuitous pics now

May 13, 2009, 02:42 PM	#15
gunnertwo Junior Member Join Date: May 13, 2009 Location: Southern Oregon Posts: 2	Newbie here. Question on the stock, is that the folder kit from SIG. Thanks... G2

May 15, 2009, 12:28 AM	#18
gunnertwo Junior Member Join Date: May 13, 2009 Location: Southern Oregon Posts: 2	Thanks Tiger-Mule for the info. That's the way I'm headed. G2

May 21, 2009, 07:36 PM	#19
Therapydude2 Member Join Date: June 3, 2007 Posts: 19	Found out my Form 1 was approved today (5/21/09)! Now just have to wait anxiously by the mail box.

May 22, 2009, 07:00 AM	#20
PTK Senior Member Join Date: March 20, 2008 Posts: 442	That pair of SBRs is beautiful. The AR is a 10.5", yes? What brand?

May 28, 2009, 11:44 AM	#21
NukeLabTech Junior Member Join Date: July 27, 2008 Location: Texas Posts: 4	I have SBR'd a 556 pistol and used the CTR stock.

May 30, 2009, 03:58 PM	#22
1iviper Junior Member Join Date: April 10, 2005 Location: NoVa Posts: 13	thank you the ar is a tactical innovations lower and lmt 10.5 upper. i've also removed the ubr from the sig and replaced it with an ace folder and ctr.still waiting on the troy rail and a front sight. and here is a pic of my .50 beo sbr

June 28, 2009, 06:52 PM	#23
Ironsights Junior Member Join Date: June 28, 2009 Posts: 1	SBR Sig 556 pistol Brand new to this. I have questions about putting a folding stock on a Sig 556 pistol.

May 25, 2010, 05:16 PM	#24
drkpac Junior Member Join Date: May 25, 2010 Posts: 2	Sig556 pistol... Yes...I'm looking to do the same thing to the 556 pistol. In fact, in addition to the folding stock, I'd like to throw on a quad rail so I can attach a vertical grip. Basically, I want to turn this thing into a bullpup carbine...is that too much to ask?? By the way, does anyone know if the barrel is threaded after taking off the muzzle brake? It'd be kinda cool to hook it up with a sound suppressor.

May 26, 2010, 06:04 PM	#25
wackendogs Member Join Date: January 26, 2010 Location: ohio Posts: 30	I made mine into an SBR. Best thing I could have done with it. I have other Ar15 SBR's but my Sig is the one I use the most.. One think I did notice is its not much quieter with my suppressor on. Last edited by wackendogs; May 26, 2010 at 06:13 PM.