HARTS 12.5″ AR-15 Complete Upper Receiver | 5.56 & .300 Blackout
Price range: $320.00 through $475.00
Configure a HARTS 12.5-inch AR-15 Complete Upper Receiver in 5.56 NATO / .223 or .300 Blackout. Choose from six colors, five muzzle devices, and with-or-without BCG options for a clean, coordinated build.
- 5.56 NATO / .223 or .300 Blackout
- Free-float M-LOK handguard
- Six color choices and five muzzle-device options
- Available with or without a BCG
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HARTS 12.5" AR-15 Complete Upper Receiver
Build a balanced AR-15 with a HARTS 12.5-inch Complete Upper Receiver configured around your preferred caliber, finish, and muzzle device. The assembled upper combines a precision-machined receiver with a free-float M-LOK handguard for a clean profile and practical accessory space.
Choose between 5.56 NATO / .223 and .300 Blackout, then select from six finishes and five muzzle-device configurations. With and without BCG options allow you to order the assembly that fits your existing parts and budget.
Choose Your Configuration
- Barrel: 12.5-inch configuration
- Caliber: 5.56 NATO / .223 or .300 Blackout
- Colors: Black, blue, bronze, purple, red, and silver
- Muzzle devices: Black A2 bird cage, stainless A2 bird cage, HARTS-FSFH, PHASE1 black, or PHASE1 FDE
- BCG: Available with or without a bolt carrier group
Key Features
- Complete assembled AR-15 upper receiver
- Free-float M-LOK handguard
- Multiple finish and muzzle-device combinations
- Configurable BCG selection
What Is Included
Your selected configuration includes the assembled upper receiver, installed handguard, and selected muzzle device. A BCG is included only when the “With” option is selected.
Compatibility
Designed for standard mil-spec AR-15 lower receivers. Confirm the selected caliber, ammunition, BCG, muzzle device, and lower-receiver compatibility before assembly or use.
Additional information
| Color | Black, Blue, Bronze, Purple, Red, Silver |
|---|---|
| Firearm | AR-15 |
| Muzzle Device | A2 Bird Cage Black (MZ1001), A2 Bird Cage Stainless (1001SS), AR Fake Can / Flash Hider (MZ-FSFH), Phase-1 Two Piece Muzzle Device Black (Phase-1LA), Phase-1 Two Piece Muzzle Device FDE (Phase-1FLA) |
| BCG | With, Without |
| Caliber | .223 / 5.56, .300 Blackout |
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