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View Full Version : Ruger SR-556 v.s. Sig 556


Kyle24
05-18-2010, 10:15 PM
Looking to get either the Ruger version or the Sig Version any one have any feed back on either model?

reidnez
05-18-2010, 10:20 PM
Don't get confused, they're completely different rifles. The Ruger 556 is a gas-piston AR15. The Sig 556 is a proprietary design. Neither is a "version" of the other, though they are the same caliber and fairly similar in operation.

UserM4
05-18-2010, 10:29 PM
You should compare the SR-556 to the SIG516

thmpr
05-18-2010, 10:32 PM
Get a LWRC or a LMT if you are thinking of heading into the piston system. Both are proven.

Josh3239
05-18-2010, 11:16 PM
:iagree: or Addax.

UserM4
05-18-2010, 11:30 PM
Or even Robinson XCR and POF.

IsaacGlass
05-19-2010, 12:18 AM
LMT or Addax :thumbsup:

supermario
05-19-2010, 12:23 AM
The Sig 556 is also a great rifle, most people dont like it because you cant interchange with AR15 parts, except for the stock and muzzle device. Oh and it uses Ar mags. I have one and its a great gun.

Manic Moran
05-19-2010, 8:50 AM
I think the SIG's got the best stock trigger I've ever found on a non-competition rifle.

No, it's not an AR or an AR-compatible. Some people have described it as an AK47 which is more accurate (and more expensive), and if you look at the internal mechanisms, particularly the breech block and slide design, you can see the similarities. The block and slide are physically connected to the piston, as long as there's gas pushing the piston back, the slide is going back. No requirements to rely on inertia from a gas pulse like many designs. And in case of disaster, the regulator is very easily changed from 'normal' to 'adverse' allowing even more gas to go back.

Problem is that the design is a tad front-heavy. Great for follow-on shots, mind, but a little tiring on the arms.

I can't speak for the Ruger.

NTM

bombadillo
05-19-2010, 9:02 AM
Or Mega! (Adams arms)

http://www.rainierarms.com/img/shop/product/91e291c1a197afea6e18524450e6cb0e.jpg

http://www.rainierarms.com/?page=shop/detail&product_id=1892


I don't know what it is about that Mega monolithic upper, but it is SWEET :punk:

dfletcher
05-19-2010, 9:09 AM
I like the Sig better than the AR, with the exception of the lousy trigger which, I don't think much can be done about. Aside from looks (very subjective I know) the Sig seems to have a crisper, smoother function about it.

sd1023x
05-19-2010, 9:11 AM
I would say Sig 556, purpose built piston over a 'retro-fit'. Sig 55x series has been around for decades, been used around the world.

Its a tough gun, check out factory technical test data and test documentation!

2.- Weapon service life

2.1 Service life of individual components

The service life or individual components is classified into 4 groups as follows:

a) min. 10000 rounds for wearing parts of the bolt assembly
b) min. 15000 rounds barrel life
c) min. 15000 rounds for all other secondary components
d) min. 30000 rounds for major components.


2.2 Extended service life / Functional safety

- Experience indicates that depending on the grade of ammunition used, the barrel has to be changed after approx. 20000 up to 30000 rounds have been fired.

-15000 rounds for wearing parts of the bolt assembly are quite feasible: other small components will last for anything up to 30000 rounds.

-Major components such as trigger housing, bolt, receiver, plastic parts, the main components of the trigger action may readily be expected to withstand 40000 rounds.

-We have weapons at our plant which have major components still fully functional after firing 80000 up to 100000 rounds.

A sig 516 would be a fairer comparison.

Sunday
05-19-2010, 10:43 AM
The best for the money is a BCM top end and an off list lower. Less $$$ than either choice and much better quality.

Josh3239
05-19-2010, 11:42 AM
The best for the money is a BCM top end and an off list lower. Less $$$ than either choice and much better quality.

:iagree: also.

TZL
05-19-2010, 2:44 PM
Agreed, best stock trigger on a black rifle, a but front heavy, but a UBR balances nicely

I think the SIG's got the best stock trigger I've ever found on a non-competition rifle.

No, it's not an AR or an AR-compatible. Some people have described it as an AK47 which is more accurate (and more expensive), and if you look at the internal mechanisms, particularly the breech block and slide design, you can see the similarities. The block and slide are physically connected to the piston, as long as there's gas pushing the piston back, the slide is going back. No requirements to rely on inertia from a gas pulse like many designs. And in case of disaster, the regulator is very easily changed from 'normal' to 'adverse' allowing even more gas to go back.

Problem is that the design is a tad front-heavy. Great for follow-on shots, mind, but a little tiring on the arms.

I can't speak for the Ruger.

NTM

Standard
05-19-2010, 3:11 PM
Look at XCR's as well. A lot of additional features.
http://image.absoluteastronomy.com/images/encyclopediaimages/x/xc/xcr_l_left.gif

GM4spd
05-19-2010, 4:11 PM
I wouldn't compare a Ruger SR-556 to a SIG 556 under any circumstances.
Pete

cmaher55
05-19-2010, 4:33 PM
I went into a gun store with the intention of buying a Ruger 556 or an M&P AR. I ended up buying the Sig 556. I liked the Ruger and had shot one before and wanted to get one. After holding the Sig in my arms, and a few other AR types from various manufacturers, I bought the Sig. I have not been sorry. The thing is dead on accurate and flawless in operation with several different manufacturer .556 rounds. Hold them all and the right rifle will speak to you..! Regards