To SBR or Not To SBR, That is the Question...

Tim

Tim

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Whether 'tis nobler in the mind to cut and thread,
To sling lead that costs an outrageous fortune,
Or to take arms against a sea of troubles
And by opposing end the thought. To cut—to sell...,

OK, enough of that....


I have this Sig 556 16" that picked up a couple weeks ago. I dig it. Shoots great, I like the folding stock. The iron sights are good enough for what it's for.

So of course I want to change it up. Should I SBR it...cut the barrel back to just ahead of the piston and thread for suppressor host? The folding stock and short barrel would make a sweet truck gun, nice and compact.

What trouble am I borrowing by cutting back the barrel on a piston operated system?
Resale on these things is pretty strong right now, SBR'ing it would make it effectively mine for life.
Sig 556 is discontinued, so I run the risk of getting stuck with a broken down SBR that I can't source parts for.

For reference, I have 3 SBR'd AR lowers on hand already.
IMG_1764.jpg
 
Neither, you don’t need a Sig... but fortunately I might be able to take it off your hands.

In all seriousness, I personally love the look of the SBR 556. I say go for it buddy. And please post pictures. (Dibs if you decide to sell it...lol)


These are not as over gassed as the HK piston guns. I am not sure how the run with the barrel cut. The MR556 and 416s run into cycling issues without the port welded up or gas block completely changed. I am not sure what the difference is in the Sig 16” and 11”.
 
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You could add a folding stock to one of your existing SBR rifle.
 
For me, I would have to shoot it a couple of thousand rounds (in today's market, a few hundred) to make sure it was a forever rifle. Meaning a gun that I would never sell, and it would be left in my trust when I'm dead and gone. If the gun doesn't shoot well, comfortable to carry, and pleasant to shoot, I wouldn't waste the money on a tax stamp. With that said I would like to try out a Sig 556. What's your impressions so far?
 
Average Joe said:
For me, I would have to shoot it a couple of thousand rounds (in today's market, a few hundred) to make sure it was a forever rifle. Meaning a gun that I would never sell, and it would be left in my trust when I'm dead and gone. If the gun doesn't shoot well, comfortable to carry, and pleasant to shoot, I wouldn't waste the money on a tax stamp. With that said I would like to try out a Sig 556. What's your impressions so far?
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I like it! I have not shot for groups, just ~5 MOA steel out to a couple hundred yards. I’m looking for a nice compact, low mount prism scope to put on it.
 
Tim said:
I like it! I have not shot for groups, just ~5 MOA steel out to a couple hundred yards. I’m looking for a nice compact, low mount prism scope to put on it.
Click to expand...

Sounds like a new member of the SBR family [emoji4]


Sent from my iPhone using Tapatalk
 
I SBR’d mine. After the barrel was cut down it wouldn’t cycle reliably on either the normal or adverse settings. After futzing with it for a while I had a gunsmith enlarge the gas ports and that solved the problem. It has run like a top since.

I SBR’d mine before SIG discontinued it. I probably wouldn’t have if I had know that was going to happen. I like the gun but the lack of platform support could eventually be a problem. 0B3F852D-9FFB-40B6-9A20-67EB6DF811DE.jpeg
 
Tim said:
Well, I'm gonna see if I can sell it. If not, then I'll revisit the SBR route. I really don't want to cut it up.
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I think i saw uppers on sale for about $600 the other day... could try investing some money in fun?
 
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