The Orthos Arms Raider S4 is a semi-automatic shotgun chambered in 12 gauge with an 18.5-inch barrel. It holds 6 rounds and is finished in a gray Cerakote coating. 
 

Key Specifications 

• Brand: Orthos Arms 
• Model: Raider S4 
• Caliber: 12 Gauge 
• Action: Semi Auto 
• Capacity: 6 rounds 
• Barrel Length: 18.5 inches 
• Color/Finish: Gray Cerakote 
   

Detailed Features 

• Semi-automatic action with 18.5-inch barrel 
• 6-round capacity 
• Gray Cerakote finish for corrosion resistance 
• Compact configuration suited for home defense or close-quarters use

Owners of the Orthos Arms Raider S4 tend to focus on its compact 18.5-inch barrel and the practical gray Cerakote finish. The semi-auto platform and 6-round capacity are the main draws, and most buyers report that it cycles standard buckshot loads reliably from the first range session.

Ergonomics get mixed marks. The shorter barrel makes the Raider S4 easier to maneuver in tight spaces, which home-defense buyers appreciate, but a few shooters find the overall balance requires adjustment when transitioning from a longer-barreled field gun. The Cerakote finish is consistently praised for holding up to hard use.

Orthos Arms is a newer name in the market, which comes up in owner conversations about long-term support and parts. Value perception is generally positive given the feature set, though some buyers note they would prefer more aftermarket accessory options than are currently available.