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Sons of Liberty Gun Works M4-L89 Upper Receiver Group, Upper Receiver, 5.56 NATO, 14.5" Barrel with Pinned and Welded Plan B Flash Hider (16" OAL), Fits AR-15, Matte Finish, Black, Includes 13.75" L89 Rail, Does Not Include BCG or Charging Handle U-M4L89-556-145-PB
| Manufacturer | SONS OF LIBERTY GUN WORKS |
| Model | M4-L89 Upper Receiver Group |
| UPC | 657628673033 |
| SKU | U-M4L89-556-145-PB |
| Width | 3.2500 |
| Length | 30.5000 |
| Height | 3.0000 |
| Weight | 4.0600 |


