![AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-54-AR10P/AR-10-308-13-5-Barrel-12-M-LOK-Handguard-Pistol-Upper-Build-U54-ASSEMBLED(1)-1000x1000.jpg "AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]")
![AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-54-AR10P/AR-10-308-13-5-Barrel-12-M-LOK-Handguard-Pistol-Upper-Build-U54-ASSEMBLED(2)-1000x1000.jpg "AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]")
![AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/NEW-BCG-308-OPTION-ADD-ON-OPTIONAL-1000x1000.jpg "AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]")
![AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/NEW-SIGHTS%20OPTION-ADD-ON-OPTIONAL-1-1000x1000.jpg "AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]")
-21 %
![AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-54-AR10P/AR-10-308-13-5-Barrel-12-M-LOK-Handguard-Pistol-Upper-Build-U54-ASSEMBLED(1)-800x800.jpg "AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]")
![AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-54-AR10P/AR-10-308-13-5-Barrel-12-M-LOK-Handguard-Pistol-Upper-Build-U54-ASSEMBLED(2)-800x800.jpg "AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]")
![AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/NEW-BCG-308-OPTION-ADD-ON-OPTIONAL-800x800.jpg "AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]")
![AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/RIFLE-UPPER-OPTION-PIC/NEW-SIGHTS%20OPTION-ADD-ON-OPTIONAL-1-800x800.jpg "AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]")
AR-10 / LR-308 13.5'' Barrel 12'' M-LOK Handguard | Pistol Upper Build UPK54 [ASSEMBLED]
- Stock: In Stock
- Model: UPK-54-AR10P
Product Views: 11191
$419.99
$529.99
- NEW ARRIVALS
- BESTSELLERS New
- PROMOTIONS
- AR RIFLE KITS
- ASSEMBLED UPPER
-
AR PARTS
-
AR-15 Parts
- Barrels
- Bolt Carrier Groups
- Buffers
- Buffer Springs
- Buffer Tubes
- Charging Handles
- Dust Covers
- End Plate
- Forward Assists
- Gas Blocks/Tubes
- Handguards
- Lower Parts
- Muzzle Brakes
- Pistol Grips
- Stocks
- Upper receivers
- Upper Parts Combos
- Buffer Tube Kits / Stocks
- Lower Build Combos
- Lower Parts Kits
- Pistol Braces / Stabilizer
- AR-9 Parts
-
AR-10 Parts
- Pistol Brace/ Stabilizer
- Barrels
- Upper Receivers
- Bolt Carrier Groups
- Buffers
- Buffer Springs
- Buffer Tubes
- Charging handles
- Dust Covers
- End Plate
- Forward Assists
- Gas Blocks / Tubes
- Handguards
- Lower Parts
- Muzzle Brakes
- Pistol Grips
- Stocks
- Upper Parts Combos
- Buffer Tube Kits / Stocks
- Lower Build Combos
- Lower Parts Kits
- AR-47
- 300 Blackout
-
AR-15 Parts
- ENGRAVING
-
COLOR
- GOLD (GLD)
- STAINLESS STEEL & SILVER (S)
- RAW (RAW)
- ANODIZED (T) TAN
- ANODIZED (R) RED
- ANODIZED (BL) BLUE
- ANODIZED OTHER COLORS
- CERAKOTE (BLK) BLACK
- CERAKOTE (BBR) BURNT BRONZE
- CERAKOTE (FDE) FLAT DARK EARTH
- CERAKOTE (ODG) OD-GREEN
- CERAKOTE (RGB) ROBINS EGG
- CERAKOTE (RED) RED
- CERAKOTE (PNK) PINK
- CERAKOTE (SGY) SNIPER GRAY
- CERAKOTE (JBL) JESSE JAMES
- CERAKOTE (NBL) NRA BLUE
- CERAKOTE (PUR) PURPLE
- CERAKOTE (ELG) EAGLE-LITE GREEN
- POLYMER (T) TAN
- POLYMER (FDE) FLAT DARK EARTH
- POLYMER (ODG) OD-GREEN
- ACCESSORIES
- PLATFORMS
- CLEARANCE
![[Optional] Signature Required](https://outdoorsportsusa.com/image/cache/SIGNATURE-REQUIRED(2)-600x600.jpg "[Optional] Signature Required")
-600x600.jpg "AR-10 / LR-308 Standard M4 Style Lower Build Kit | Mil-Spec")
-600x600.jpg "AR-10 / LR-308 Carbine Buffer Spring")
-600x600.jpg "AR-10 / LR-308 Collapsible Stock Buffer 4.3 oz. |Short Version")
