Rock River Arms Tactical Carbine – Complete Upper Receiver, 450 Bushmaster
Experience unmatched firepower and precision with the Rock River Arms Tactical Carbine complete upper receiver, chambered in the powerful 450 Bushmaster. Engineered for the modern shooter, this AR‑15‑compatible upper delivers exceptional performance in a compact, durable package. Whether you’re hunting, target shooting, or preparing for tactical scenarios, this upper receiver provides the reliability and accuracy you demand.
Key Features & Benefits
- 450 Bushmaster Cartridge: Delivers high muzzle velocity and superior terminal performance on medium to large game.
- 16‑inch Barrel with Mid‑Length Gas System: Optimizes gas flow for reduced recoil, smoother cycling, and enhanced reliability.
- RRA Operator Muzzle Brake: Reduces recoil and muzzle rise, keeping you on target for faster follow‑up shots.
- RRA 13‑inch Free Float M‑LOK Handguard: Provides a lightweight, modular platform for accessories while maintaining barrel harmonics for improved accuracy.
- Anodized Black Finish: Offers superior corrosion resistance and a sleek, tactical aesthetic.
- Fits AR‑15 Lower Receivers: Seamlessly integrates with your existing AR‑15 platform for a complete, ready‑to‑fire rifle.
- Complete Package: Includes bolt carrier group, charging handle assembly, 5‑round magazine, and a single 450 Bushmaster cartridge for immediate testing.
Technical Specifications
| Specification | Detail |
|---|
| Caliber | 450 Bushmaster |
| Barrel Length | 16 inches (406 mm) |
| Gas System | Mid‑Length |
| Muzzle Device | RRA Operator Muzzle Brake |
| Handguard | RRA 13‑inch Free Float M‑LOK |
| Finish | Anodized Black |
| Compatibility | AR‑15 lower receivers |
| Included Magazine | 5‑round, 450 Bushmaster |
| Included Ammunition | 1 × 450 Bushmaster cartridge |
| UPC | 842834125548 |
| Part Number | 450B0592 |
Why Choose the Rock River Arms Tactical Carbine Upper?
Rock River Arms is renowned for crafting high‑quality firearms that combine American engineering with rigorous testing. This tactical carbine upper is no exception. The mid‑length gas system ensures reliable operation with a wide range of ammunition loads, while the free‑float handguard maintains barrel integrity for consistent shot placement. The integrated RRA Operator muzzle brake dramatically cuts recoil, giving you tighter groupings and faster follow‑up shots.
Ideal Applications
- Medium‑range hunting – perfect for deer, hogs, and other big game.
- Precision shooting – excellent for competition and training.
- Tactical and defensive use – reliable performance in high‑stress situations.
- Custom builds – a versatile foundation for any AR‑15 enthusiast.
Installation & Compatibility
The upper receiver is designed to bolt directly onto any standard AR‑15 lower receiver using the included bolt carrier group and charging handle assembly. No additional machining or modification is required. Simply attach the lower, insert the provided magazine, and you’re ready to fire.
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Upgrade your AR‑15 platform today with the ultimate combination of power, precision, and durability.
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