Product specifications
| Manufacturer | Heckler and Koch (HK USA) |
|---|---|
| Type | Accessory-Uppers |
| Barrel Length | 11" |
| Finish | Matte Black |
| Model | MR556A4 URK |
| Caliber/Gauge | 223 Rem | 5.56 NATO |
| Rate of Twist | 1-in-7" |
| Feature 1 | Includes Bolt and Buffer |
| Feature 2 | M-Lok Handguard |
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