Build a compact AR-15 platform with the BATTLEARMS AUTHORITY ELITE AR15/M4 7.5-inch 300BLK Complete Billet Upper Receiver. This assembled upper pairs a short .300 AAC Blackout barrel with a precision-machined billet receiver, full-auto-rated bolt carrier group, and ambidextrous charging handle for a ready-to-mount configuration.
Designed for compatibility with mil-spec AR-15/M4 lower receivers, this 300BLK upper supports subsonic and supersonic ammunition. Its free-float M-LOK handguard offers modular accessory mounting, while durable finishes help resist everyday wear. A considered option for compact builds and range use, it includes key components to simplify your build process.
- Complete billet AR-15/M4 upper receiver assembly, ready to mount on a compatible lower.
- 7.5-inch .300 AAC Blackout barrel with a 1:7 twist rate.
- CNC-machined 7075-T6 billet receiver with MIL-SPEC feed ramps, forward assist, and ejection port.
- Full-auto-rated BCG with Carpenter 158-style bolt; MPI inspection where applicable.
- RACK-15 ambidextrous charging handle for convenient operation from either side.
- Free-float M-LOK handguard with barrel nut and mounting hardware included.
- Hardcoat-anodized receiver finish; barrel finish and muzzle threading may vary by configuration.
Package includes the assembled AUTHORITY ELITE upper, pre-installed barrel, BCG, charging handle, handguard, and applicable hardware. Verify barrel threading before selecting muzzle devices, and have installation and headspacing checked by a qualified gunsmith. Confirm compatibility and all federal, state, and local requirements before purchase or use; SBR builds may require additional authorization. FFL requirements vary by jurisdiction. Limited warranty applies; contact the seller for terms, configuration details, and availability.
