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.
| Series | A4 |
| Model | MR556 |
| Caliber | 5.56x45mm |
| Barrel Length Range | 11" to 11.99" |
| Operating System | Gas Piston |
| Capacity | 10+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 | 10 |
| Receiver Finish | Patriot Brown |
| Weight | 6.61 lbs |
| Stock Finish | Black |
WARNING!⚠️
NO ON-LINE SALES! Please contact us for More Information at diego@heartoftexasarsenal.com
PURCHASE POLICIES
- All firearm sales are final. NO RETURNS.
- Return to manufacturer for warranty service.
- Actual buyer must pickup from FFL dealer who will conduct the background check.
- Firearm transfer must be the actual transferee/buyer
- All firearm purchases require valid U.S. government issued ID and related firearm paperwork.
- You must pass a criminal background check for all firearm purchases.
- Age and residency restrictions apply.
- You must meet all other requirements as set forth by applicable Federal, state and local statutes, rules and regulations for firearm purchase.
- Other terms and conditions may apply.
- HEART OF TEXAS ARSENAL reserves the right to refuse the sale of firearms to anyone for any reason.
- It is your responsibility to ensure that you are in compliance with all applicable laws, rules and regulations for the purchase of firearms.
- Please note a 10% restocking fee will be charged if your item is not picked up.
- A fee would not apply if your item is incorrect, damaged, or a failed background check occurs.
