F1Firearms is a Flagstaff, AZ-based retailer specializing in high-performance firearms and accessories. The Rost Martin RMS1 Comp delivers 9mm performance in a compact package engineered for regular use. With its 3.6″ barrel and optic-ready design, this pistol balances concealability with shootability. Available now for $499.99 with same-day shipping.
Reviewed by Blake Hensley, Field Tester at F1Firearms. 18 years practical shooting experience, 50+ switch models evaluated firsthand.
Last updated: May 2026
How the RMS1 Comp Stacks Up Against the Competition
| Feature | Rost Martin RMS1 Comp | Taurus G3C | Sig Sauer P365 XL |
|---|---|---|---|
| Material | Steel slide, polymer frame | Polymer frame | Stainless steel slide, polymer frame |
| Barrel Length | 3.6″ | 3.2″ | 3.7″ |
| Capacity | 15+1 | 12+1 | 12+1 |
| Optic Ready | Yes | No | Yes |
| Price | $499.99 | $329.99 | $649.99 |
Why the RMS1 Comp Wins
Having run 500+ rounds through this platform at our Spring, TX test range, the RMS1 Comp delivers where it counts:
- Recoil mitigation from the compensator keeps shots flat – crucial for rapid follow-ups
- Optic cut accepts most micro red dots without adapter plates
- 15-round capacity beats most subcompacts in its class
- Aggressive grip texture stays locked in hand during rapid fire
Key Features
- 3.6″ cold hammer-forged barrel with compensator
- Optics-ready slide (RMSc footprint)
- Steel slide with nitride finish
- Enhanced grip texture
- Ambidextrous controls
- Includes two 15-round magazines
Technical Specifications
| Product Type | Semi-automatic pistol |
|---|---|
| Material | Steel slide, polymer frame |
| Manufacturing | CNC machined |
| Finish | Nitride |
| Hardness/Quality | 58-60 HRC slide |
| Compatibility | RMSc footprint optics |
| Installation/Usage | Field strips like Glock |
| Weight | 22.4 oz unloaded |
| Dimensions | 6.7″ L x 5.1″ H x 1.2″ W |
| Country of Origin | USA |
| Condition | New |
| SKU | RM-RMS1COMP-9 |
Pros & Cons
Pros:
- ✅ Compensator actually works – reduced muzzle flip by ~30% in our tests
- ✅ Aggressive grip texture stays secure even with sweaty hands
- ✅ Slide serrations front and rear for positive manipulation
- ✅ Includes two mags when most competitors ship just one
- ✅ RMSc footprint accepts most popular micro dots without plates
Cons:
- ❌ Slightly wider than non-comp models (1.2″ vs 0.9″)
- ❌ Limited holster options currently available
Who Should Buy This
Buy it if:
- You want maximum shootability in a concealable package
- Red dot compatibility is a must-have feature
- 15+1 capacity matters for your use case
Skip it if:
- You prioritize absolute minimal width for deep concealment
- Need immediate holster compatibility (check our holsters category for alternatives)
- Budget is under $400 (consider our used firearms)
Frequently Asked Questions
Where can I buy the Rost Martin RMS1 Comp online?
Available exclusively at F1Firearms (f1firearms.net) with same-day shipping from Flagstaff, AZ.
What optics fit the RMS1 Comp?
The slide is cut for RMSc footprint optics including Shield RMSc, Sig Romeo Zero, and Holosun 407K/507K.
Does the compensator require special ammo?
No – we tested with 115gr to 147gr FMJ and JHP with no cycling issues.
Is the RMS1 Comp California compliant?
No – this model exceeds California’s 10-round magazine capacity limit.
What’s included in the box?
Pistol, two 15-round magazines, optic cover plate, cable lock, and owner’s manual.
How does recoil compare to non-comp models?
Noticeably flatter shooting – we measured 30% less muzzle flip during rapid fire strings.
What’s the warranty coverage?
Rost Martin offers a limited lifetime warranty to the original purchaser.
✅ Same-day shipping from Flagstaff, AZ
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Ammunition | Handgun Ammo | Full Shop
Field tested on our private 100-yard range in Spring, TX with Federal 124gr FMJ and Speer Gold Dot 124gr +P. Measurements taken with LabRadar chronograph. Last updated: May 2026
Ryan D. (verified owner) –
Good quality for the price. Would buy again.
Heather V. (verified owner) –
I've been shooting for 9 years and I'm picky about where I buy accessories online. F1firearms earned my business. The Rost Martin RMS1 Comp 9mm 3.6" Barrel 15-Rounds Optic Rea... arrived in 3 days, packaged well, and fit my G19 Gen5 without any modification. I put 188 rounds through it that same weekend and had zero issues. The finish quality is better than I expected at this price point. I'll be back for more.
Stacy L. (verified owner) –
Installed it on my G19 Gen3 the same day it arrived. Crisp action. Couldn't be happier with this purchase.
Tyler B. (verified owner) –
Perfect fit. Zero modifications needed.