Ruger SR556 FB Rifle, AR-15 16", 223/5.56

Ruger SR556 FB Rifle, AR-15 16", 223/5.56
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Manufacturer Number:
223 Remington
Ruger SR556
Unit of Measure:


Four-position chrome plated gas regulator is adjustable and may be closed completely for manual operation during training or when using a suppressor. Quad rail handguard provides four Mil-Std 1913 Picatinny rails and is alignment with the flattop receiver provides space for mounting sights or other accessories. Troy Industries folding battlesights. Six-position telescoping M4 style buttstock. Cold hammer-forged chrome-lined Mil-Spec 41V45 barrel. Hogue monogrip pistol grip. Includes chrome-plated bolt, bolt carrier and extractor, rail covers, soft sided carry case and three MagPul Pmag 30 round magazines. 1:9 right hand twist. 6 grooves.
The Ruger SR-556FB (FB= Standard Model) offers Ruger’s legendary rugged reliability while redefining the AR platform with piston driven performance. SR-556 rifles come feature-packed and pre-accessorized, and include the following:

** Chrome-plated, two-stage piston driven operating system provides improved reliability over gas driven rifles
** 4-position, chrome-plated gas regulator allows operator to tune rifle to specific ammunition or rifle conditions

** Chambered in the popular 5.56mm NATO/.223 Rem., the SR-556 comes with 1 MAGPUL PMAG 30-round magazine
** Chrome-plated bolt, bolt carrier and extractor aid in performance and durability
** Cold hammer-forged, chrome-lined Mil-Spec 41V45 barrel provides long-lasting accuracy
** Troy Industries Folding BattleSights are adjustable and co-witness with Mil-Spec optics so they can be easily removed to make room for high-power scopes
** Troy Industries Quad Rail Handguard provides rigid mount for piston driven transfer rod
** Troy Industries Rail Covers provide comfortable hold for unused Picatinny rails
** 6-Position Telescoping M4-Style Buttstock is collapsible and allows the length of pull to be adjusted from 10.25” to 13.50”
** Hogue® Monogrip® Pistol Grip with finger grooves provides comfort when carrying and shooting
AR-style SR-556 ships with 10" Troy Industries Quad Rail, Three Troy Industries Rail Covers, 1 30-Round MagPul Magazine, and a soft Ruger case. Also includes Hogue® Monogrip® Pistol Grip.
Update 6/8/2009
First field test of the SR556- Sheridan, Wyoming. Ruger factory sponsored prairie dog hunt. We were privileged to attend the hunt, and an Impact employee was the first to take an animal with the SR556 rifle!
Function and reliability were 100%. The dog town we were shooting at had dogs out to 360 yards. All ranging was done using the new Ziess 8x binoculars with range and holdover function. Even with a low 10x scope, dogs were taken all the way out to 361 yards. Very impressive for any rifle!
We were shooting Hornady TAP ammo, 55g, loaded into the P-Mags that are included with each rifle. Effect on the targets was devastating. Multiple hits and complex gymnastics by the dogs were the norm.
All in all, our experience with the SR556 was beyond our expectations. The gas system gives the gun a softer recoil that a standard gas AR, and the chamber/bolt area was much cleaner that a gas AR. This SR556 is a keeper, and a really good value with all the good kit that is part of the base rifle.
Update Fall 2011: We have sold literally hunderds of the Ruger SR556 rifles. They are incredibly reliable and several of our customers report that even after thousands of rounds (some without cleaning) they have not experienced a single malfunction!

^Two stage adjustable piston^
  • Category : Tactical Rifles
  • Action : Semi-Automatic
  • Caliber : 223 Remington/5.56 NATO
  • Barrel Length : 16.1"
  • Capacity : 30+1
  • Trigger : Standard
  • Safety : Lever
  • OAL : 32.75"-36"
  • Weight : 7.94 lbs
  • Stock Description : 6-Position Black
  • Metal Finish : Black

14 Reviews

  • Fast delivery, very happy

    Posted by Ed on Jan 9th 2014

    received this weapon in about a week. i'm very happy with impact guns. I will be a return customer.

  • Great Gun From Ruger

    Posted by Dkoonz on May 1st 2013

    I bought my sr 556 about a year and a half ago from impact guns and the service was great. I couldn't be happier with this gun. I have shot every make of ammo I could find and never had any problems with it. Put a Acog on the gun and a bipod. This gun is easy to clean and is also very accurate. Real happy with this purchase. Thanks Impact.

  • Best AR platform I've ever had

    Posted by Billstaf on Jan 23rd 2013

    Got a new SR556FB in October 2011. It came with the newer, reworked bolt carrier. Carrier tilt is not an issue on this gun.

    This rifle is by far the best AR I've ever had. It is also my first piston gun. I've heard all of the arguments both pro and con about piston guns vs. DI guns. I've now owned both and I'm sticking with the gas piston setup. These guns run cleaner and cooler. That by itself is enough reason to switch to a piston rifle. DI ARs get filthy very quickly. At least mine always did.

    I'm not a huge fan of the Ruger trigger on this gun. I know is is a mil-spec part, but I still think Ruger could have done better. The pull is a little too long and a little too heavy. You get used to it though. I hear that Gissele makes great AR trigger sets and I may go that way someday, but Ruger gets about $1500 for these guns (before Sandy Hook), so I would have expected a premium trigger on the rifle.

    Same with the M4 butt stock. This is a standard part on almost all ARs, but the Magpul units are quite a bit better. I agree with an earlier poster that Ruger should have sat down and done a deal with Magpul. Heck you already get 3 nice Magpul Pmags with the gun anyway, so a nifty Magpul stock seems like a good fit with the Ruger.

    Despite all that, I love this rifle. Amazingly accurate right out of the box. All the right surfaces are hard chromed. Everything is up to snuff.

  • Awesome!

    Posted by Juice on Dec 18th 2012

    This was my first AR and I just cant imagine anything better! I bought it a few years back not long after they came out. I've put 1000's of rounds through her and she has yet to let me down. I love that it comes loaded with iron sights, full rail, hand guards,ajustable stock, dust cover,forward assist and so on. Its also easy to clean and take apart. You also dont need to play with adjusting the piston very much either. Once you have it in the right spot leave it alone. I would get another one in the 7.2 if they come out with it.

  • Great gun! Worth every penny!

    Posted by simr49 on Apr 26th 2012

    Impact Guns did a great job getting the gun delivered within a week. Great case, the 3 mags were a bonus too! Very high quality AR. Important note...these sr556's have the new rounded bolt carrier to decrease carrier tilt. I'm not worried about it, but thought you may like to know. No play at all between the upper and lower assembly, super tight fit. Heard a lot of people don't like the trigger. It's fine. Not as gritty as a few other ar's I've tried. The only gripe I have is the buttstock is not that great compared to a magpul. C'mon ruger, you cut a deal with Troy for the sites and rails, can't you cut a deal with magpul too? Just saying. Before shooting I gave mine a good cleaning to get all the grease and other gunk from the factory out of it. Took it to the range today. Ran about a 100 rounds through it with no failures shooting m855 62gr rounds. At 25yds was getting dime size groupings. Haven't had a chance to see how it does at a 100yds yet but very pleased with the operation and accuracy thus far. I had originally ordered a Rock River but the wait was almost 4 months(at least) so I cancelled it. Someday I'll pick up a rock river upper when their wait period is less to have a DI gun too. No regrets at all though. This thing is great. Happy buying!

  • Perfect Right Out Of The Box

    Posted by AlexanderAF on Mar 28th 2012

    I ordered this rifle and had it delivered to a local Gun store where I picked it up. I was pleased to see that it came with three 30-round PMAG magazines, even though ImpactGuns says it only ships with one (mine was shipped to NV, not CA).

    Pictures do not do this rifle justice. It is beautiful! It has a good, solid feel to it as well. I disassembled it and everything looked well oiled right out of the box (no cosmoline or grease).

    I took it out with my sister and we had a blast shooting it. Recoil is not punishing, but it is still thrilling to shoot. For fun, quite a few times we would quickly pop off 30 rounds and it never jammed once. We went through about 200-300 rounds with brass federal ammo and had no issues whatsoever.

    When I brought it home, I disassembled it again for cleaning. The insides did not get as dirty as I would've expected. It still looked pretty clean. I also did not see any signs of carrier tilt. I gave it a good cleaning and packed it away for next time, where I'll take my wife out shooting (also, my new EOTECH red dot sight arrives!).

  • A Ruger to Own

    Posted by CZPaul on Feb 18th 2012

    I've had my SR556 for 2yrs and rarely clean the the bolt, gas block, or piston. Converted my flash suppressor to one of Gemtech's adaptors last summer and run an HVT 308 on my SR with a Timney trgr. OMG..You should find Black Hills 69gr blue bx reloaded as incredibly accurate - 0.5" - when running a better than stock trigger & gd glass. Fiocchi 50grVmxs are xclnt too. Weakest link in the SR is that grinding trigger! It sucks. This rifle flat out impresses and turns in groups anyone would envy. I'd swear it was police sniper grade, but just a bit heavy for patrol work.

  • I was issued an M16 in the 70's the AR has arrived

    Posted by boomer on Dec 11th 2011

    Best AR I have owned and one of the best overall I have ever shot. Gas piston set on 0 firing single shot with an AAC Suppressor is something to be a awe of. Throwing the Upper onto a select fire POF and running full auto gives you results as good if not better than the POF or HK Piston uppers. Throw the upper back onto the Ruger Lower, pull the piston, wipe it off and away you go. Ready to shoot shotgun hulls at 100 yards all over again.

  • I really like my 556!

    Posted by TD on Oct 25th 2011

    I have owned this gun for nearly a year and have shot approximately 2000 shells. This gun is indestructible! IIt requires very little maintenance, especially the bolt. That is always very clean. You do have to pull that small valve out to clean, which is easy. Overall, I am very happy with this very accurate 223.

  • Accuracy vs. Weight vs. Durability

    Posted by East on Sep 29th 2011

    Amazing fire arm, my only drawback was the weight.great to take out shooting and have fun with, but could not picture this being an end all be all weapon system; unless of course Ruger or another company comes out with some mods to lower weight like that rail system... hint hint. But other than that nothing but perfection from the weapon system and on top of that, well built and very rugged materials to boot!

  • My Review

    Posted by Adam on Jul 23rd 2011

    I bought this rifle while I was home on leave, and I'll say that this was the best 1500 I've ever spent on this rifle, didn't get to put 1000 rounds through it, but first time taking it out I put as many rounds through it as fast I could and the accuracy was absolutely amazing. Ruger really went all out into making this rifle, and the bast part about I can fully customize to my specifications.

  • A wonderful gun

    Posted by Joamd6 on Jan 5th 2011

    I love this gun. Got it about 2 weeks ago and have already put nearly a 1000 rounds through it without a single failure. The only weakness the gun had was the trigger, which is not unusual to almost all guns. Put a Timney 3 lb single stage in and it's perfect! I would recomend this gun to everyone.

  • SR 556 is superb

    Posted by Nathan on Dec 16th 2010

    I don't need to go into detail about the benefits and drawbacks of M16/AR15 platform. Eugene Stoner did a great job, but Ruger made it much better. Now you can get the fit and accuracy of the AR, with more AK-like reliability. I've owned six Rugers (currently 4) and loved every one of them.

    Nobody buys an AR and leaves it stock anymore. Everybody kits them up. Ruger gives you all of the essentials with Troy industry flip up sights and quad rail. It comes with a nice Hogue grip, 3 Magpul composite mags (which are nice and quiet and more reliable than anything the Army ever gave me) and a great, soft carry case. The stock and recoil tube is mil-spec unlike many AR's out there. And you get all this for a much better price than most pay to kit up their X-brand AR's.

    Whether you shoot one round, or 20 magazines full, you will notice how much cleaner the bolt and internals are over a standard gas AR. Although 5.56/.223 has mild recoil anyway, you actually can feel slightly less recoil with this system than with traditional AR's of similar size/weight.

    The Ruger SR 556 is accurate, solidly reliable, and kitted up for a better price than you can get from most AR makers, especially for the build quality.

    If I could have used this in the army I would have traded any M16/M4 I was issued (Colt's and FN's) for this. Cannot praise it enough.

    Go to Impact or order one online today, you will not regret it.

  • perfect choice

    Posted by Elliott on Nov 14th 2010

    The Ruger 556 is the perfect choice for someone that wants a fully optioned out ar-15 out of the box. The troy battle sights and handguards are state of the art. The modern gas piston makes maintanence easy and the chromed chamber and bolt make this a reliable piece.

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This purchase comes with the Impact Guns Lifetime Warranty  (Read More)



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