Rost Martin
Rost Martin RM1CX Comp
The compensated model of Rost Martin's RM1X series, announced September 2, 2026. It adds an integrated compensator venting through a port in the top of the slide to the RM1CX's full-size grip and compact slide, and keeps the base gun's 17-round flush and 19-round extended magazine pair. The muzzle is not threaded; the Tactical is the threaded model.
Key Highlights
- •Integrated compensator vents through a port in the top of the slide to cut muzzle rise
- •Keeps the 17-round flush and 19-round extended magazine pair of the base RM1CX
- •Full-size RM1F grip dimensions on the compact slide, optics ready with an RMR plate included
Specifications
- Price
- $549
- Weight
- 1 lb 7 oz
- Calibers
- 9mm
- Rail Type
- picatinny
- Best For
- range traininghome defense
Capability Profile
0-10 Scale Across 8 Axes
Compatibility Tags
Overview
The Rost Martin RM1CX Comp is the compensated model in the RM1X series. It shares the line's architecture, a compact slide over the full-size RM1F grip at 5.1 inches tall and 1.2 inches wide, and adds an integrated compensator that vents through a scalloped port cut into the top of the slide ahead of the front sight. The base RM1CX slide is solid in that spot.
A compensator and a threaded barrel answer opposite questions, which is the choice this model forces. Venting gas upward holds the muzzle down between shots and makes the gun flatter to shoot fast, which is a range, class, and competition benefit. It also means the muzzle is committed: the Comp is not threaded, so a suppressor is not on the table for this model. Buyers who want the can rather than the flat recoil should take the RM1CX Tactical instead.
Everything else matches the base gun. The magazine pair is the same 17-round flush and 19-round extended set, the slide is nitrocarburized steel and optics ready with an RMR-footprint plate included, the trigger is Rost Martin's 5 lb Double Action Striker, the controls are fully ambidextrous, and the dust cover carries a multi-slot accessory rail.
Key Features
- Integrated compensator venting through a port in the top of the slide
- Full-size RM1F grip dimensions on a compact slide
- 17+1 flush capacity, with one 17-round and one 19-round magazine included
- Nitrocarburized steel slide
- Optics ready with an RMR-footprint plate included
- Double Action Striker (DAS) trigger, 5 lbs
- Fully ambidextrous controls
- Accessory rail on the dust cover
Pros
- +Integrated compensator is factory-fitted rather than an aftermarket barrel swap
- +Keeps the base gun's flush 17 and extended 19-round magazines
- +RMR-footprint plate included rather than sold separately
- +Ambidextrous controls and a full-size grip on a compact slide
Cons
- −No threaded muzzle, so this model cannot host a suppressor
- −Compensator vents gas and flash upward, which is unpleasant in low light
- −Grip length is full-size, so it conceals like a full-size gun
- −Smaller holster and aftermarket ecosystem than the major brands
Detailed Specifications
- caliber
- 9mm
- height
- 5.1 inches with flush magazine
- width
- 1.2 inches at the grip
- weight
- 23 oz with flush magazine
- capacity
- 17+1 flush, 19-round extended magazine included
- trigger
- Double Action Striker (DAS), 5 lbs
- sights
- Black serrated rear, white dot front
- Muzzle Device
- Integrated compensator, unthreaded muzzle
- slide
- Nitrocarburized steel, optics ready with RMR plate included
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