I just posted a full review of the HK MR556A1.
http://www.youtube.com/watch?v=Yb_Ok410yuw
Here’s part II, the disassembly video. It will give you some visibility into the internals of the rifle.
http://www.youtube.com/watch?v=Ogj3hx_ARRQ
Questions and comments are welcome.
shot it < and just about all of them a good runnin rifle is a good runnin rifle no matter the make. shot a double star m4 16 in with a aimpoint pro today both new out the box after 5 minutes of tunning its a mans best freind, bustin ide 4"clays at 150 yrds. can all of them take punishment is the question. hk is known for that
I think the MR556 can really be a winner of they just change a few things. Give me a lighter profile barrel, available short barrels and a full auto BCG. I’d prefer chrome lined but if the Krauts really are using some kind of unicorn tears barrel steel then maybe it doesn’t need to be? If HK can fix the above things, I might just buy an MR556. I’d be sold on a 10.5in barreled version.
Excellent video review as always (I really enjoy the AK vids). I wonder what niche of the market the MR will fit into with so much of the AR market all ready filled.
Thanks for the excellent review!! I was going to ask you about the oddly angled grip, but you answered that at the end of the video. Well done!
Very well done, yours is one of the few I have watched from beginning to end, informative and to the point, I have to keep a look out for more of your reviews 
A great review. About every question that could be answered was. I had considered one of these but due to slips in the availability, I went ahead and purchased an SR-15. I’m glad I did. The weight is the big issue. I did get to look at an MR556 at a local shop. Their price was $2750.
not digging the fact that you need that tool to use the takedown pins. First thing I would change out is to put standard takedown pins in it.
Great videos! Thanks for posting them. It’ll be interesting to see if they offer just the upper at some point. That’d illuminate the PMag issue.
Cant watch it now but will later. Ive liked all your reviews so far and am looking forward to this one.
Handling the MR556 at the local shop kinda disapointed me. It screams quality but I cant get over the weight.
great review. ive been waiting for you to do this since you announced it. thank you
You should watch out, lightning may strike you down after committing the unacceptable heresy of mating the HK upper to an Olympic Arms lower.:nono:
I was wondering about this as well. If they are dimensionally the same I swap them out.
This is one of the best videos I have seen thus far explaining the various nuances about the MR556. Overall it gets an A+.
takedown thing wouldnt be as bad if could use a bullet tip…but you cant even use that according to the vid. Not cool to me. Im not sold on the firing pin retaining pin being captive like that either and also requiring that tool.
… What?
OP: Great video. Better than others.
Beat me to it. How about WTF?
Good review.
Great review. Thanks.
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Thanks for the review, it was very well put together.
The one thing i disagree about is how the rifle actually feels when shooting it.
I always thought that the recoil was VERY sharp in the shoulder, much like most piston guns. The one major difference is that the 416 is a hell of alot smoother than say an LWRC.
I have yet to meet a Piston gun, no matter how well manufactured that ran as smoothly and as softly as a DI gun.
Any more thoughts on this?
Also, i will say that the one caveat to this is that ive only shot the standard 416, never the MR556 so i may have to eat crow on the above statements. Perhaps the NINE pound weight dampens that recoil impulse a bit?
WOW i don’t feel that at all, I found my MR223 to be very smooth compared to most AR’s i have shot…little more than my Noveske i own, not that it matters…