HK MR556 SBR (Civilian HK416)

    The H&K MR556 rifle is essentially a 416 without select-fire capability, but this video showcases an MR556 that has been brought up to near 416 specs. With a chopped barrel and a few other modifications, the gun could fool all but the most discerning onlookers. So, how does it shoot?

    Transcript …

    (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) – Hey guys, it’s Alex T with TFBTV, and today we’re taking a look at my H&K MR556 SBR that I tried to get as close in appearance to an H&K 416D as possible.

    All in all I think it’s a little project that’s turned out pretty well, and in my opinion the gun looks very neat.

    Basically I started with a used HK MR556 that I got for a song, paid for a stamp, cut the barrel down to 10 inches, had selector markings engraved, had the barrel reprofiled.

    Anyways the 416 is a carbine that really is making some waves around the world.

    Essentially it’s an M16 with a short stroke piston, but a very well made version of one.

    They also just have a lot of features a lot of people might like, like the stock comes from the factory with the ability to store batteries, tools, whatever.

    However I found that it’s nice for keeping NFA paperwork there, this is the Form 1 for the tax stamp.

    There’s also another one, a Form 4 for the suppressor I occasionally mount on there.

    You can also take the butt pad off and put a concave or convex one on there if you’d like.

    Right here’s where you can store batteries in the grip, not a unique feature to this gun, but it comes from the factory like that.

    Now the magazines are where I’d like to give a little bit of praise, they’re interesting.

    They are coated in a maritime-resistant finish that allows for 96 hours worth of saltwater corrosion resistance, a little excessive for me as a civilian.

    Another interesting feature is there’s a small round rubber buffer on the floorplate that holds the whole magazine together when firing grenades.

    The rear iron sight is adjustable for windage by pressing down this little detent and rotating this knob.

    And it does flip down for storage or running an optic or something like that.

    You’ll adjust it for elevation by pulling this up and rotating it.

    Interesting iron sight, well thought out, and one cool thing is how it removes, you actually pop it off by pressing this backwards and pulling it right off there.

    And it actually does return to zero when you put it back on the Picatinny rail system, which is nice.

    The front sight does not have any adjustment, but it does fold flat, in case the user is running an optic, and they don’t want it to interfere with that.

    So that is a nice feature as well.

    It attaches right to the gas block and it does get very hot.

    Now to remove the handguard, first pop off your rail cover if you’re running one like I am.

    And use a hex key, and go ahead and unscrew this bolt.

    I have seen videos of guys in the military using the actual bolt lugs to undo this, but I’ve also seen people advising against that, for obvious reasons.

    And here you can see the piston system.

    If you’re familiar with the G36, it’s actually very reminiscent of it.

    But let’s send a few more rounds downrange suppressed.

    (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) If you’re comfortable shooting an AR-15 rifle then really the MR556 and by extension, the 416 should feel pretty familiar to you.

    Aside from being a bit more front heavy than a DI rifle this gun has no special or unusual handling characteristics.

    The trigger’s a bit lighter than a standard semiauto AR-15 trigger, so that’s nice, and the stock and grip from the factory are both really comfortable.

    The E1 stock while a bit large and bulky offers a great cheek weld, and of course you could simply put one on any other AR-15.

    (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) (rifle fires) So at this point I thought it might be neat to showcase the piston system in action.

    This is full speed right here, so obviously you really can’t see anything with the naked eye happening up front.

    As it does happen at an incredible amount of speed, but at first I’m going to slow it down real quick to one-quarter speed, and you can see it jump just a little bit.

    But then we slow it down to one-tenth speed, you can see the piston and op rod jump quite a bit.

    Pretty neat! So at this point it’s time to move on to the accuracy portion of the test, let’s go ahead and remove that rear iron sight.

    You don’t really have to do this, it does fold down, but I like the optic to be pretty far back on most of my rifles, so it’s easy just to pop it off with this iron sight.

    And I’m using a 4X ACOG with some arm’s throw levers, because I do like to switch it between guns for testing.

    So using my Polaris Ranger as a makeshift shooting bench until I can finish my two shooting benches I’m currently in the process with, I shoot a couple of five-shot groups with standard M193 military ball ammunition so 55 grain ammunition out of a 10-inch barrel, at about 100 yards here.

    I did not have time to do a 300 yard test that day but it is something I would like to revisit in the future.

    I know this rifle is capable of great accuracy, after all, MR does stand for match rifle, at least as is my understanding, and HK’s excuse for not going to the chrome-lined bore was for enhanced accuracy.

    I’d rather have a chrome-lined bore, but that’s just me.

    It’s my understanding also that the new rifles either are coming with a chrome-lined bore or do have a chrome-lined bore so that’s good news.

    But let’s go ahead and check out the targets and see how it performed.

    So on the first target we printed a little over an inch, which was actually one of the best groups I’ve ever shot with this gun, I’m not going to lie.

    That’s unusual to get a group that small with this rifle in my hands.

    But the second group is a little bit more reflective of what I typically get out of the gun which is about two inches.

    It’s a 1.6, 1.7 MOA gun out of all the groups I’ve shot with it.

    I hope you guys enjoyed this video, I normally don’t show little pet projects of mine but I made an exception in this case.

    It was requested, and yeah, I hope you enjoyed this video.

    Thanks for watching and I hope to see you next time.

    (rifle firing)



    Alex C.

    Alex is a Senior Writer for The Firearm Blog and Director of TFBTV.