Rost Martin RM1S Comp 9MM 3 6 Barrel Black W Viridian RFX11
Pros & cons
What works
- Integral compensator built into the barrel, no separate muzzle device needed
- Bundled Viridian RFX11 red dot already matched to the slide cut
- Four magazines included
- Subcompact size despite the compensated barrel
Trade-offs
- Newer manufacturer with less long-term track record than established brands
- Confirm California roster status before ordering, given the newer model
- Compensated recoil impulse feels different from a standard subcompact - try before buying if possible
Specs at a glance
About this product
The Rost Martin RM1S Comp is a compensated, optics-ready 9mm subcompact built around a 3.6-inch barrel with an integrated compensator machined directly into the barrel itself, and this package bundles the pistol with a Viridian RFX11 red dot sight and four magazines rather than selling the slide bare.
How does the built-in compensator work?
Unlike a bolt-on compensator that threads onto the muzzle, the RM1S Comp's compensator is machined into the barrel and paired with a matching vent cut in the slide, redirecting propellant gas upward through that cut to counter muzzle flip during recoil. Because it's integral to the barrel rather than an add-on, there's no separate thread pitch or muzzle device to buy or lose.
What's included in this bundle?
This package includes the pistol, a Viridian RFX11 red dot sight cut to the RMR footprint on the slide, and four magazines - a notable step up from the single magazine that ships with many pistols at this price point.
What are the core specs?
It's built on a polymer frame with a steel, nitride-finished slide, a 5-pound DAO trigger pull through a flat-face trigger, and white dot front / black serrated rear sights for use without the optic mounted. Overall length is about 6.7 inches and unloaded weight is roughly 19.7 ounces, keeping it in subcompact carry territory despite the integrated compensator.
Is a compensated subcompact a good concealed-carry choice?
Integral compensators are a relatively new feature on carry-size pistols, aimed at reducing felt recoil and muzzle rise for faster follow-up shots without the bulk of a separate compensator module. Whether that trade-off works for you as an everyday-carry gun comes down to how it feels and shoots in hand - we'd suggest trying to handle or rent one before buying if the compensated-carry-gun category is new to you.
Rost Martin builds the RM1 line with an emphasis on optics-ready carry pistols from the outset, rather than retrofitting optics compatibility onto an older design, which is part of why the RFX11 cut integrates cleanly with the slide's profile rather than looking like an afterthought. Ammunition compatibility is standard 9mm Luger, and the integral compensator is designed to work across common self-defense and practice loads without needing a specific ammunition type to function as intended. The four included magazines are a meaningful value add compared to pistols that ship with just one or two, giving you enough spares for a range session or a carry-and-backup setup without an immediate additional purchase. As with any pistol from a newer manufacturer, parts availability and warranty support are worth researching before you buy, particularly if you're planning to rely on it as a primary carry gun rather than a range-only pistol. Handling the RM1S Comp in person, if your FFL or a local range offers rentals, is the best way to judge whether the built-in compensator and grip length work for your hand size before committing to the purchase.
What should California buyers check before ordering?
Rost Martin is a newer manufacturer, and roster/compliance status for specific models can change - confirm the RM1S Comp's current California status and the magazine capacity your FFL is able to transfer to you before ordering.
How does the purchase process work?
As a firearm, the RM1S Comp ships to a licensed FFL dealer rather than to your home. You'll complete a background check and any required state waiting period before taking possession. Checkout on this site runs through secure checkout, and FFL transfer fees are set separately by the receiving dealer.
FFL transfer required
This item is a firearm and ships only to a licensed FFL dealer, never to a home address. At checkout, enter your preferred dealer as the shipping address, or leave it blank and we will assign a licensed dealer near you at no extra cost. You complete the background check and paperwork with the dealer when you pick up.
California buyers: handguns must be on the California roster for delivery to a California FFL, a Firearm Safety Certificate (FSC) and DROS are handled at the dealer, and the 10-day waiting period applies. Out-of-state buyers receive the firearm through their own local FFL under their state's rules.
Key attributes
| Transfer | Ships to your FFL dealer |
| Caliber | 9mm Luger |
| Capacity | 15+1 (4 magazines included) |
| Barrel Length | 3.6 in, compensated |
| Action | Striker-fired DAO |
| Optic | Viridian RFX11 red dot included |
Frequently asked questions
- Does this pistol come with a red dot?
- Yes, this package bundles a Viridian RFX11 red dot cut to the RMR footprint.
- How many magazines are included?
- Four magazines ship with this bundle.
- How does the compensator work?
- It's machined directly into the barrel and paired with a matching vent cut in the slide, rather than being a separate bolt-on device.
- Can this ship to my home?
- No. It's a firearm and must transfer through a licensed FFL dealer after a background check.
- Is Rost Martin a new brand?
- Yes, Rost Martin launched its RM1 pistol line relatively recently - confirm current California roster status with your FFL before ordering.
- What's the trigger pull like?
- A DAO trigger with roughly a 5-pound pull through a flat-face trigger design.