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| UPC | 657628673040 | Manufacturer Part # | U-M4L89-556-145-NMD |
| Model | M4-L89 Upper Receiver Group | Caliber | 556NATO |
| Color | Black | Subcategory | Upper Receivers |
| Finish | Matte | Manufacturer | Sons of Liberty Gun Works |
| Barrel Length | 14.5" | State Restrictions | California |