Description
The Rost Martin RM1C 9mm 15+1 Black 4″ COMP is a factory-compensated compact semi-auto built for shooters who want less muzzle rise without going full-size. It chambers 9mm, holds 15+1 rounds, and ships with a threaded barrel and integrated compensator out of the box. This is a practical carry and home-defense pistol that balances capacity with a 4-inch slide length.
| Manufacturer | Rost Martin |
|---|---|
| Model | RM1C |
| Material | Black polymer frame, steel slide (per manufacturer specs) |
| Compatibility | 9mm Luger, standard double-stack magazines |
| Finish | Black (BLK) – nitride or DLC-coated slide per Rost Martin |
| Weight | ~22 oz unloaded (per manufacturer specs) |
| Condition | New |
Key Features
- Factory-Integrated Compensator – Reduces muzzle flip by roughly 25% compared to a standard compact barrel, letting you stay on target for faster follow-up shots.
- 15+1 Round Capacity – Matches the magazine count of most duty-size 9mms while keeping the grip short enough for concealed carry.
- 4-Inch Barrel with Threaded Muzzle – Provides a longer sight radius than subcompacts and accepts standard 1/2×28 compensators or suppressors.
- Black Nitride Slide Finish – Resists holster wear and corrosion better than basic bluing, per Rost Martin’s materials spec.
- Optic-Ready Slide Cut – Accepts popular micro red dots (RMRcc, Holosun K-series) without needing a plate – direct mount for faster target acquisition.
Who It’s For
This pistol fits shooters who carry daily but want compensator-level recoil control without the bulk of a full-size frame. It works for range training, home defense, and concealed carry where capacity and shootability matter more than absolute smallest size. If you’ve run a Glock 19 or SIG P320 Compact and wished for less snappiness, the RM1C is worth a hard look.
Pros & Cons
- Pro: Factory comp means no extra parts to buy or fit – it’s test-fired and tuned from Rost Martin.
- Pro: 15+1 capacity in a grip length that hides under an untucked shirt.
- Con: The compensator adds about 0.75 inch to overall length compared to a standard compact slide, so holster compatibility is slightly narrower.
- Pro: Direct optic cut saves you $50–80 on aftermarket milling or adapter plates.
Comparison
| Feature | Rost Martin RM1C | Zev Technologies OZ9 Compact | Agency Arms Syndicate Compact |
|---|---|---|---|
| Barrel Length | 4″ (threaded) | 4.0″ | 4.0″ |
| Capacity | 15+1 | 15+1 | 15+1 |
| Compensator | Factory integrated | Optional aftermarket | Optional aftermarket |
| Optic Cut | Direct mount (RMRcc/Holosun K) | RMR footprint plate | RMR footprint plate |
| Price (MSRP) | $466.05 | ~$1,200 | ~$1,000 |
FAQ
Does the RM1C come with a threaded barrel or just a comp?
It ships with a threaded barrel (1/2×28) and the comp is already installed. You can remove the comp and run the barrel bare, or attach a suppressor if your state allows.
What holsters fit the RM1C with the comp attached?
Because the comp adds length, most compact holsters built for a 4.0–4.5″ slide will work. Look for holsters listed for Glock 19 with a compensator or SIG P320 Compact with a threaded barrel. Rost Martin also lists compatible holsters on their site.
Is the optic cut RMR or RMRcc?
The cut is designed for the RMRcc and Holosun K-series (407K/507K) footprint. It does not directly fit full-size RMR without an adapter plate, but Rost Martin includes the correct screws for both patterns.
How does the trigger compare to a stock Glock 19?
The RM1C trigger has a shorter take-up and a cleaner break than a factory Glock trigger, per Rost Martin’s spec sheet. Reset is tactile and audible, similar to an Apex trigger upgrade out of the box.
Can I use standard Glock 19 magazines in the RM1C?
No. The RM1C uses its own proprietary double-stack magazines. They are not cross-compatible with Glock or SIG mags. Spare mags are available from Rost Martin and retail around $35–40.
✔ Nationwide delivery (all 50 states) – ships to your FFL
✔ Ships 1-2 business days from order
✔ 30-day returns on unfired, resalable condition
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Last updated: April 2026
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