![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-331-AR15P/UPK-331-AR15P-2025-1000x1000.png)
![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-331-AR15P/UPK-331-AR15P-A-2025-1000x1000.jpg)
![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/1-2023%20NEW-BCG-N+BCG-NB-BCG-N-HM+BCG-N2-OPTION-ADD-ON-OPTIONAL-1000x1000.jpg)
![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/0-NEW-CH-OPTION-ADD-ON-OPTIONAL-2024-1000x1000.jpg)
![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/2024%20NOVEMBER%20OPTIONS/0%201%20SIGHTS-OPTIONS-2024-1000x1000.jpg)
![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/2024%20NOVEMBER%20OPTIONS/0%202%20SIGHTS-OPTIONS-2024-1000x1000.jpg)
![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/2024%20NOVEMBER%20OPTIONS/AR15-Laser-Bore-Sight-2024-1000x1000.jpg)
New
-53 %
![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-331-AR15P/UPK-331-AR15P-2025-800x800.png)
![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-331-AR15P/UPK-331-AR15P-A-2025-800x800.jpg)
![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/1-2023%20NEW-BCG-N+BCG-NB-BCG-N-HM+BCG-N2-OPTION-ADD-ON-OPTIONAL-800x800.jpg)
![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/0-NEW-CH-OPTION-ADD-ON-OPTIONAL-2024-800x800.jpg)
![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/2024%20NOVEMBER%20OPTIONS/0%201%20SIGHTS-OPTIONS-2024-800x800.jpg)
![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/2024%20NOVEMBER%20OPTIONS/0%202%20SIGHTS-OPTIONS-2024-800x800.jpg)
![AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED] AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/2024%20NOVEMBER%20OPTIONS/AR15-Laser-Bore-Sight-2024-800x800.jpg)
AR-15 .223/5.56 5" BARREL W/ 4'' HANDGUARD | PISTOL UPPER BUILD UPK331 [ASSEMBLED]
We ship fast
Most orders usually ship out fast. CERAKOTE products may take 5-7 business days to process.
- Stock: In Stock
- Model: UPK-331-AR15P
Product Views: 50
$279.99
$599.99
Available Options
CERAKOTE BLUE FLAME |AR-15 Charging Handle
CERAKOTE CAMOBLU | AR-15 Ejection Port Cover | Dust Cover Assembly - Base BLK - Pattern -BLU
.750LOW PROFILE STEEL GAS BLOCK WITH ROLL PINS & WRENCH -BLACK | GB01-B
AR-15/.223/5.56BIRDCAGE MUZZLE BRAKE W/ CRUSH WASHER | MBR05
CERAKOTE CAMO BLU |AR-15 4" Parallelogram M-Lok Handguard - Base BLK - Pattern - BLU - Madein USA
WARNING to California Residents:⚠️ According to California's Proposition 65, some products sold on this website may expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.