A versatile handgun is one that can handle several roles well. For me, that means home defense, concealed carry and protection on the trail. While I used to rely on different handguns for each job. More recently, I’ve come to appreciate a compact 9mm that can cover all three. The Rost Martin RM1S Comp is one such handgun. After extensive testing, I found it a good fit for many duties.

The RM1S offers several advantages over larger handguns. Though some shooters prefer a long-slide 9mm with an extended magazine for home defense, the RM1S is faster on target than a full-sized gun. It also conceals more easily and is more comfortable on the hip during long hours outdoors. A reliable defensive gun is more than a convenience for those who spend time hiking. Violent encounters and animal attacks, while uncommon, are real considerations.

Key Features of the RM1S Comp

The RM1S Comp features a steel slide with forward and rear cocking serrations. The slide top is serrated between the sights to reduce glare. It comes optics ready with a supplied RMR-pattern mounting plate. Additional plates are available for purchase.

The iron sights — a bold front post and serrated rear — are well designed for defensive use. They offer a clear sight picture and are properly regulated for 124-grain 9mm Luger ammunition. The striker protrudes at the rear of the slide when the pistol is cocked, offering visual confirmation of status.

Rost Martin’s RM1S Comp is a striker-fired pistol with internal safeties, including a drop safety or firing pin block and a trigger finger lever in the trigger face.

I especially like the grip frame. Its texture is ideal for rapid handling, with good adhesion. Without being too abrasive, the grip offers a good surface even if hands are wet or cold, and the grip tang is modestly elongated.

Rost Martin RM1S Specifications

Cartridge: 9mm Luger
Capacity: 12+1 rounds, 15+1 rounds
Barrel: 3.6 inches, forged steel, ported
Length: 6.7 inches
Height: 4.6 inches, 5.1 inches
Width: 1.24 inches
Slide: Steel
Finish: Nitride
Weight: 19.7 ounces
Grip: Polymer, textured, black
Trigger: 4.5 pounds
Safety: Trigger lever, internal striker drop safety
Sights: Steel, white dot (front), U-­notch (rear); optic ready with RMR plate included
MSRP: $469

The trigger guard is generous. A rail is included for mounting defensive accessories like lights.

One surprising feature is that the RM1S is fully ambidextrous with the magazine release and slide lock levers accessible from either side. This 9mm is a good option for left-handed shooters or anyone training to operate a handgun with either hand (which should be everyone).

Disassembly is straightforward and will feel familiar to those who have experience with a Glock or Canik. After confirming the pistol is unloaded, lock the slide to the rear and remove the magazine. Like the Glock, twin plungers are pulled down, but the Rost Martin slide rises off the frame rather than running forward.

Trigger and Handling

The trigger action on the RM1S is smooth, breaking cleanly at 4.5 pounds and had a sharp reset, which is important for rapid follow-up shots. It comes supplied with two steel magazines: a 12-round flush fit and 15-round extended magazine.

The 12-round magazine keeps the profile compact for concealed carry, but the 15-round magazine adds a mere ½ inch. Many will find it practical to carry the RM1S with the flush magazine loaded and the 15-round magazine on the belt. Both magazines proved easy to load and reliable over several hundred rounds.

Ported Barrel Performance and Range Testing

The Rost Martin RM1S Comp’s defining feature is the aggressively ported barrel. The angled port of the barrel combined with a corresponding slide cut redirects propellant gasses upward, resulting in less muzzle flip.

Felt recoil was only slightly diminished, but the primary benefit was improved control during rapid fire. While some flash is visible at the port, the angled design directs gases in a way that is less distracting than on some comparable ported handguns.

The RM1S proved reliable through testing with FMJ, jacketed hollow-point and all copper ammunition. There were no failures to feed, chamber, fire or eject. I tested accuracy from 15 yards from bench rest using the Birchwood Casey shooting rest. The five-shot groups demonstrated consistent performance:

  • Buffalo Bore 115-grain +P: 2.0 inches
  • Buffalo Bore 95-grain: 2.4 inches
  • Buffalo Bore 147-grain Outdoorsman: 2.0 inches

These results confirm the RM1S Comp is more than accurate enough for defensive use. I selected two loads for personal defense. The Buffalo Bore 95-grain Barnes all-copper hollow point delivers velocities exceeding 1,400 feet per second and expands reliably. This load pairs well with the ported barrel, offering strong performance with manageable recoil and minimal muzzle rise.

For trail use, I also evaluated the Buffalo Bore 147-grain Outdoorsman load. This hard-cast bullet is designed for deep penetration and is suitable for defense against larger animals. Together, these loads represent opposite ends of the penetration spectrum, highlighting the RM1S Comp’s versatility.

Optics Capability and Performance

Because the compact 9mm is optics-ready, a test with an optic was warranted. I mounted a Holosun HE507C GRX. This sight features a lock mode to prevent unintended adjustments, a green reticle that many shooters prefer over red and a multiple reticle system offering both dot and circle-dot configurations. The solar failsafe and shake-awake function add practical reliability for defensive use.

As expected, speed to an accurate first shot was improved. Target acquisition was faster, and follow-up shots were more consistent. The RM1S Comp’s ergonomics and slide design work well with carry optics.

Rost Martin RM1S Comp for Carry, Home Defense and Trail Use

During the evaluation, I carried the pistol in a Kifaru belt pack. This setup worked well for hiking and spelunking as the pistol was out of the way and there was plenty of room for keys, first-aid gear and a compass.

The Rost Martin RM1S Comp is a well-thought-out compact 9mm pistol that manages to cover a lot of ground. On the trail, the RM1S is light enough to carry comfortably yet capable of handling a wide range of defensive loads. It is also compact enough to carry daily with the proper holster while still offering the control and capacity needed for serious use.

There are tradeoffs. The porting produces some flash, and the shorter grip may not suit every hand. However, the RM1S Comp delivers solid performance where it counts. It is a versatile handgun that will appeal to those looking for a single pistol to handle concealed carry, home defense and outdoor use.

For another top compensated carry option, see our SIG Sauer P365 XL Spectre Comp review.