The Orthos Arms Raider S4 is a semi-automatic shotgun chambered in 12 Gauge with an 18.5-inch barrel. It ships with a 6+1 capacity and an M-LOK handguard for accessory mounting, finished in the Alpine Elite color scheme. 
 

Key Specifications 

• Brand: Orthos Arms 
• Model: Raider S4 
• Caliber: 12 Gauge 
• Action: Semi Auto 
• Capacity: 6+1 
• Barrel Length: 18.5 in 
• Color/Finish: Alpine Elite 
   

Detailed Features 

• 18.5-inch barrel suited to a tactical/home-defense role 
• M-LOK handguard for mounting lights, lasers, or grips 
• 6+1 shell capacity 
• Alpine Elite finish on the receiver and furniture 
• 3-inch chamber (per second title)

Owners of the Raider S4 generally appreciate the M-LOK handguard layout, which lets them run a forend light without adapters. The 18.5-inch barrel keeps the package short without crossing into paperwork territory, and most find the ergonomics easy to manage for both new and experienced shooters.

Reliability early on gets mixed marks. Some owners run several hundred rounds without a hiccup, while others note that the action is picky about lower-brass loads until it breaks in. The consensus is to stick with full-power loads for the first range sessions.

The Alpine Elite finish gets consistent compliments for how it looks out of the box, though a few owners note the coating on the receiver can show wear at contact points after extended use. For the price bracket, most consider it a solid entry into the tactical semi-auto shotgun category.