The Troy A4 300BO Complete AR-15 Upper Receiver with Sights is a versatile upper design to enhance the AR-15 Platform. This quality upper comes in two variations a 10.5” barrel with 9.25″ Gen2 SOCC BattleRail M-LOK handguard, or a 12.5” barrel with 10.5″ Gen2 SOCC BattleRail M-LOK handguard,  both chambered in 300BO and equipped with a Medieval flash hider.

Each SOCC BattleRail M-LOK handguard gives you plenty of room to mount your favorite accessories, so you can customize your AR to fit your shooting style. Additionally, this upper receiver kit comes equipped with the industries #1 folding sights.

Additional information

Dimensions 10.5 in
Barrel Length

10.5", 12.5"

Upper Receiver 300BO Gen2 SOCC

SKU#: SUPG-3AC-10BT-23


Customers must read Compliance Information before purchasing.


  • TROY Gen2 SOCC Rail

  • TROY Medieval Flash Hider


  • Caliber 300BO

  • Operating System Gas Operated

  • Material Aircraft Grade 6061-T6 Aluminum