Heckler & Koch HK MR556A4 11″ 5.56 MLOK Pistol
The latest update from HK-USA to the commercial variant of the legendary HK416, the MR556 A4 and MR762 A4 represent an enhanced example of “no compromise” HK performance.
Its short-stroke gas piston operating system does not impart hot carbon fouling back into the action, allowing the weapon to run longer, with less maintenance and with less wear on internal components than direct-impingement ARs. Its adjustable gas regulator allows the operator to tune the action specifically for suppressed or unsuppressed operation. Fully ambidextrous controls, lighter weight and a slimmer profile make the new A4 easier to operate, manipulate and employ.
For those who demand an AR with unmatched capability and uncompromising reliability and durability, the MR A4s remain the top tier solution.
Specifications
- Length: 26.5″
- Weight: 6 lbs 9.76oz
- Caliber: 5.56mm
- Color: Black
- Lower Receiver: Forged, HK Ambidextrous
- Upper Receiver: Forged, HK MR556A4
- BCG: MR556A4
- Rail: MLOK
- Trigger: HK Two-Stage
- Barrel: 11″ Cold Hammer-Forged Barrel, 1:7 Twist
- Gas System: Short-Stroke Gas Piston
- Gas Block: Adjustable
- Charging Handle: HK Ambidextrous
- Muzzle Device: Birdcage
- Lower Parts Kit: Ambidextrous
- Buffer Tube: 6 Position
- Buffer Assembly: HK Heavy Buffer
- Stock: None
- Grip: HK
Jordan W. (verified owner) –
This is my second time ordering from Rooftop and again absolutely excellent customer service and shipping!! This is the best company I have ever dealt with buying firearms online. Item as described and in perfect condition. Thoroughly enjoy my ramen I got with it too!
Stefan F. (verified owner) –
Unbelievably high quality. I’ve owned them all: KAC, JP, FN; they don’t hold a candle to this thing.
Brandon (verified owner) –
My new favorite SBR. Exceeded my expectations on every front. Will be picking up the 16″ variant soon.
Zach H. (verified owner) –
By far the best fighting carbine I’ve ever handled. Zeroed at 25 yard indoor range and there was no perceivable impact shift after putting on a high back pressure can. The gas piston system does add some weight to the front but it is well balanced and shoots flat. There are plenty of carbines on the market that do 95% for half the price, but if you can afford it it’s worth every penny.
CURTIS C. (verified owner) –
I’m loving the experience I am having with my HK. It’s a wonderful weapon. I’m so glad I ran across rooftop defense. It’s my first time ordering a weapon online and the transaction fast and efficient this will be my go to for purchasing future weapons. Thanks rooftop defense.