ASK AN EXPERTDescription
- 16.5" cold hammer forged barrel
- 1 in 7 twist rate
- Proprietary gas piston operating system
- Free float key mod handguard
- Enhanced two-stage trigger
The HK MR556A1 5.56mm 16.5in 30rd Semi-Automatic Rifle (81000459) is a premium level commercial/civilian firearm with match rifle capability. It features a proprietary gas piston operating system, free float key mod handguard, enhanced two-stage trigger, and a 16.5" cold hammer forged barrel with 1 in 7 twist rate. HK does not chrome line their barrels as they found it can sometimes mask imperfections that negatively affect accuracy.
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Warranty Information
| Type | Semi-Automatic |
| Caliber | 5.56x45 mm |
| Capacity | 30 Rounds |
| Barrel Length, in | 16.5" |
| Barrel Profile | 6 Lands & Grooves Right Twist 1 in 7 in |
| Safety | Two Position |
| Stock | 6-Position |
| Trigger | Two Stage |
| Metal Finish | Black Nitride |
| Stock Extended Length, in | 37.68" |
| Stock Retracted Length, in | 33.90" |
| Width, in | 3.07" |
| Height, in | 9.45" |
| Weight (Without Magazine), lbs | 8.60 |
