Product Description
| 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 | 6 Position |
| Barrel Description | Threaded |
| Barrel Length | 11" |
| Max Capacity | 30 |
| Receiver Finish | Patriot Brown |
| Weight | 6.61 lbs |
| Stock Finish | Black |
