The MR556 A4 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. 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.
| Brand | HK |
| Category | Tactical Pistols |
| Series | A4 |
| Model | MR556 |
| Caliber | 5.56x45mm |
| Barrel Length Range | 11" to 11.99" |
| Operating System | Gas Piston |
| Capacity | 30+1 |
| Stock Material | Synthetic |
| Action | Semi-Auto |
| OAL | 26.50" |
| Hand | Ambidextrous |
| Sights | None |
| Barrel Finish | Black |
| Barrel Material | Steel |
| Twist | 1:7" |
| Receiver Description | Picatinny Rail |
| Grips | Black Polymer |
| Handguards | M-LOK |
| Trigger Pull Weight | 4.50-5.60 lbs |
| Grooves | 6 |
| Height | 7.50" |
| Safety | Ambidextrous Safety Lever |
| Thread Pattern | 5 / 8"x24 |
| Width | 3.07" |
| Stock Description | Pistol Tube |
| Barrel Description | Threaded |
| Barrel Length | 11" |
| Max Capacity | 30 |
| Receiver Finish | Black |
| Weight | 6.61 lbs |
| Stock Finish | Black |
All sales are final
