The Rost Martin RM1S is a sub-compact semi-automatic pistol chambered in 9mm Luger with a 3.60-inch match barrel. It has an optics-ready, serrated slide with an RMR footprint cut and a polymer frame. This version is California compliant and ships with a 10-round magazine. 
 

Key Specifications 

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

Detailed Features 

• 3.60-inch match barrel 
• Optics-ready slide with RMR footprint cut 
• Serrated slide for positive cycling grip 
• Sub-compact polymer frame 
• California compliant configuration

Owners of the RM1S generally appreciate the optics-ready setup out of the box, noting that the RMR footprint cut makes mounting a red dot straightforward without additional milling. The match barrel draws favorable comments for accuracy at typical handgun distances.

The sub-compact size is a practical fit for concealed carry, though some shooters find the 3.60-inch barrel leaves a bit of velocity on the table compared to compact or full-size options. The serrated slide is functional; a few users mention the grip texture could be more aggressive for wet-hand use.

Value perception leans positive for buyers looking at an optics-ready sub-compact at this price tier. The California-compliant configuration limits some capacity options, which is a known trade-off rather than a product criticism, but it does come up in discussions about the RM1S compared to other market options.