ASK AN EXPERTDescription
- 11in Heavy profile barrel
- M-LOK attachment system
- Gas-piston system
- Ambidextrous safety
The latest update from HK-USA to the commercial variant of the legendary HK416, the H&K MR556 A4 5.56x45mm 11in 30rd Semi-Automatic AR Pistol represents 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. While 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.
A wide variety of accessories can be added to increase its functionality. As the world's most popular rifle, the MR556 A4 is supported by an aftermarket loaded with lots of great accessories, from rails and handguards all the way up to everything you need to make your own legally-registered short-barreled rifle.
Warranty Information
| Action | Short Stroke Gas Piston Semi-automatic |
| Caliber | 5.56 x 45mm NATO |
| Barrel Length, in | 11" |
| Barrel Thread Pitch | 1/2x28" |
| Barrel Profile & Twist | 6 Lands & Grooves, 1:7" Right Hand Twist |
| Magazine Capacity | 30 Rounds |
| Magazine Included | 1 |
| Safety | Ambidextrous AR Selector |
| Overall Length, in | 26.5" |
| Overall Height, in | 7.5" |
| Overall Width, in | 3.07" |
| Picatinny Length, in | 16.75" |
| Weight (Without Magazine), lb | 6.61 |
| Magazine Weight, lb | 0.20 |
