The Black Rain Ordnance Fission is a semi-automatic AR-15 chambered in 5.56x45mm NATO with a 16-inch barrel. The receiver is machined from 7075 T6 aluminum and finished in Battleworn Cerakote Burnt Bronze. At 7.80 lbs it's not ultralight, but it's well-balanced and carries comfortably. 
 

Key Specifications 

• Caliber: 5.56x45mm NATO 
• Barrel Length: 16 inches 
• Capacity: 30+1 rounds 
• Weight: 7.80 lbs 
• Action Type: Semi-Automatic 
• Finish Color: Burnt Bronze (Battleworn Cerakote) 
• Manufacturer: Black Rain Ordnance 
• Model Number: Fission 
   

Detailed Features 

• 7075 T6 Aluminum Receiver: The upper and lower are machined from 7075 T6 aluminum, which is the standard alloy used in mil-spec AR builds. 
• Optic Ready: No front sight tower; the flattop upper accepts any standard Picatinny-compatible optic. 
• Magpul MOE Adjustable Stock: Six-position adjustable stock for length-of-pull adjustment. 
• A2 Flash Hider: Standard A2 birdcage helps reduce visible muzzle flash. 
   

Usage 

The Fission works well as a general-purpose range rifle or home defense gun. The Burnt Bronze Cerakote finish is the main differentiator from a standard black AR — the finish is durable and the battleworn look is intentional. Magazines, optics, and most standard AR-15 accessories are all compatible without modification.

Owners of the Black Rain Fission AR-15 in Burnt Bronze tend to be satisfied with what they got. The finish draws the most attention — the Battleworn Cerakote look is genuinely distinctive, and most buyers specifically wanted that aesthetic.

On the functional side, reliability gets good marks. The rifle feeds reliably across common 5.56 ammunition types. Accuracy is described as solid for a 16-inch semi-auto at typical range distances.

The price point comes up frequently. Most owners think the quality justifies it, but some comparisons to mil-spec-equivalent rifles from other builders make it harder to recommend without reservation. Parts and accessories are standard AR-15 compatible, so that concern isn't really valid — the rifle uses nothing proprietary.

Overall the Fission is seen as a well-made AR with a distinctive finish. It's not trying to be a lightweight precision tool; it's a solid platform that looks different from the typical flat-dark-earth or black AR on the rack.