The Troy A4 5.56 NATO Complete AR-15 Upper Receiver with Sights is a lightweight, versatile upper design to enhance the AR-15 Platform. This quality upper comes in two variations a 14.5” barrel with 12.5″ X-Series BattleRail M-LOK handguard, or a 16” barrel with 15.125″ X-Series BattleRail M-LOK handguard all chambered in 5.56 NATO and equipped with a TPRS flash hider.

Each X-Series BattleRail M-LOK handguard gives you extra M-LOK slots to mount your favorite accessories, so you can customize your AR-15 to fit your shooting style. Additionally, this upper receiver kit comes equipped with the industries #1 folding sights.

Additional information

Barrel Length

14.5", 16"

Upper Receiver SPC-A4 X-Series

SKU#: SUPG-A4X-14BT-00


Customers must read Compliance Information before purchasing.


  • TROY X-Series Rail

  • TROY TPRS Flash Hider


  • Caliber 5.56

  • Operating System Gas Operated

  • Material Aircraft Grade 6061-T6 Aluminum