The Rost Martin RM1S is a striker-fired subcompact 9mm pistol with a 3.60-inch match-grade barrel and an integrated compensator. The slide is optics-ready with an RMR footprint and features serrations. Capacity is 10+1 and this configuration is California-compliant. 
 

Key Specifications 

• Brand: Rost Martin 
• Model: RM1S 
• Caliber: 9mm 
• Action: Semi Auto 
• Barrel Length: 3.60 inches 
• Capacity: 10+1 
• Color/Finish: Black 
   

Detailed Features 

• Integrated compensator built into the slide 
• Optics-ready with RMR footprint for direct red dot mounting 
• Match-grade 3.60-inch barrel 
• Serrated slide for positive manipulation 
• California-compliant 10+1 configuration

Owners of the RM1S Comp pay particular attention to the integrated compensator. On a subcompact 9mm, muzzle rise is a real factor, and shooters who have run the compensated version back-to-back with the standard slide note a visible difference in felt recoil and return to target. Whether that difference is worth it in a carry-sized pistol is where opinions split.

The optics-ready slide with RMR footprint is well-regarded among owners who want to run a mini red dot without an adapter plate. The factory cut sits low enough that co-witnessing with suppressor-height sights is not required, which not every shooter prefers. Some buyers are happy with the included iron sights and find the optic cut unnecessary for their use case.

Value perception for the RM1S is mixed. Shooters familiar with other striker-fired subcompacts tend to view the integrated compensator as a differentiator that justifies the platform's existence. Others find the trigger feel underwhelming compared to pricier competitors, and that criticism comes up consistently in longer-term owner feedback.