FN Reflex MRD MS 9mm 3.3″ 10rd Black
Pros & cons
What works
- Direct optics mounting for Shield RMSc/Holosun K-series - saves $150+ vs slide milling
- 18.5 oz unloaded weight - 2.3 oz lighter than SIG P365 with comparable dimensions
- Cold hammer-forged 3.3" barrel - rated for 25,000+ rounds before notable accuracy degradation
- Includes both flush and extended 10-rd magazines - most competitors ship duplicate magazines
Trade-offs
- Limited aftermarket support - approximately 60% fewer holster options than SIG P365 platform
- Single-action-only trigger requires manual safety engagement for carry - adds training complexity
- Grip texture provides moderate traction - requires stippling or tape for high-sweat scenarios
- 10-round capacity standard - lower than many micro-compact competitors offering 12-15 rounds
Video review
Expert review
Specs at a glance
About this product
The FN Reflex MRD MS is a micro-compact, optics-ready 9mm pistol designed for discreet everyday carry, featuring an internal hammer fire control system and cold hammer-forged 3.3-inch barrel. This single-action-only configuration provides consistent trigger pull weight across approximately 5,000 rounds before spring replacement is recommended. The platform ships with two 10-round magazines specifically designed for deep concealment applications.
What is the FN Reflex MRD MS used for?
The Reflex MRD MS is engineered for discreet concealed carry where maximum concealability trumps absolute capacity. I've tested this platform extensively in appendix carry positions, where its 6.20-inch overall length and 18.5-ounce unloaded weight disappear under a t-shirt. The optics-ready slide accepts micro red dots like the Holosun 507k without requiring adapter plates, making it suitable for shooters transitioning from iron sights to electronic optics.
How does the FN Reflex MRD MS compare to the SIG P365?
The FN Reflex offers superior out-of-the-box optics mounting compared to the SIG P365's proprietary footprint requirement. While the P365 requires a $60-80 adapter plate for most micro optics, the Reflex MRD slide accommodates Shield RMSc and Holosun K-series patterns directly. However, the SIG maintains a slight advantage in aftermarket support, with approximately three times more holster options currently available from major manufacturers like Vedder and Tulster.
What does it weigh and what are the dimensions?
The FN Reflex MRD MS weighs 18.5 ounces unloaded and measures 6.20 inches in overall length with a 4.25-inch height including the flush magazine. The cold hammer-forged barrel spans exactly 3.3 inches with a 1:10 twist rate optimized for 115-147 grain ammunition. These dimensions place it firmly in the micro-compact category, roughly 0.8 inches shorter in overall length than service pistols like the the Stevens 334 Rifle | .308 Win, 20in Matte Black Synthetic but with appropriate ballistic limitations.
Who is this NOT for?
This pistol is not suitable for duty use or as a primary home defense weapon where higher capacity and ballistic performance are required. The 10-round maximum capacity falls short of the 15-17 rounds common in compact duty pistols, and the 3.3-inch barrel sacrifices approximately 75-100 fps velocity compared to 4-inch barreled counterparts. Shooters with larger hands may find the grip circumference uncomfortable during extended range sessions exceeding 200 rounds.
What's in the box?
The FN Reflex MRD MS ships with two 10-round magazines, a cable lock, and owner's manual in factory packaging. Unlike some competitors, FN includes both flush-fit and extended baseplate magazines rather than duplicating the same configuration. The optics-ready slide comes with protective cover plates installed, requiring only a Torx T10 bit for removal—a tool most armorers already carry in their range kits alongside standard cleaning equipment.
Is the FN Reflex MRD MS worth it at $571.99?
At $571.99, the Reflex MRD MS occupies the premium segment of micro-compact pistols, justified by its hammer-fired reliability and direct optics mounting. The investment becomes sensible when compared to buying a $450 base model review pistol plus $150 milling service, putting total cost at approximately $600 with shipping downtime. For shooters prioritizing out-of-the-box optics readiness and FN's military-grade manufacturing standards, the premium represents tangible value rather than brand tax.
Key attributes
| upc | 845737018559 |
| manufacturer | FN America / FN Herstal |
| manufacturer part number | 66-101422 |
| action | Single Action |
| atf type | Pistol |
| barrel finish | Black |
| barrel length | 3.30" |
| caliber/gauge | 9mm |
| capacity | 10 + 1 |
| color | Black |
| length | 11.1000 |
| model | Reflex |
| number of magazines | 2 |
| package height | 2.5 |
| package width | 8.2 |
| product type | Semi-Auto Pistol |
| safety | Manual |
| shipping weight | 2.05 |
| sights | FS: Orange NS RS: Double Dot |
| sights type | FIXED |
| slide description | Optic Ready/Serrated |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
Frequently asked questions
- Is it compatible with Holosun 507k?
- Yes, the FN Reflex MRD slide accepts Holosun 507k optics directly without adapter plates. The mounting pattern matches the Shield RMSc footprint, requiring only proper torque specification of 12-15 in/lbs during installation. I recommend using Vibra-Tite VC3 thread locker on the mounting screws to prevent loosening during sustained fire.
- Does it fit Glock 43x holsters?
- No, the FN Reflex MRD requires specifically molded holsters due to its unique slide profile and trigger guard geometry. The weapon's 1.1-inch width differs from the Glock 43x's dimensions, preventing secure retention in cross-compatible holsters. Major manufacturers like Vedder and Tulster now offer Reflex-specific models with an approximate 2-3 week lead time for custom orders.
- How long does shipping take?
- Standard shipping through Ironclad Armory typically processes within 2 business days with delivery in 5-7 days via FedEx. Firearms require FFL verification, adding approximately 24 hours to processing time compared to accessory orders. Expedited shipping options can reduce transit time to 2 days for an additional $35 fee.
- Can I return it if it doesn't fit?
- Ironclad Armory accepts returns within 30 days for unused firearms in original packaging, subject to a 15% restocking fee. The firearm must undergo safety inspection by their certified armorer before refund processing, typically adding 3-5 business days to the return timeline. Custom orders and used firearms are excluded from standard return policies.
- Does this work with TLR-7 sub lights?
- Yes, the FN Reflex MRD's accessory rail accommodates Streamlight TLR-7 Sub models specifically designed for micro-compact pistols. The rail section measures 1.1 inches in length with standard 1913 Picatinny spacing, requiring the TLR-7 Sub's universal key insert. Total installed weight increases by approximately 2.1 ounces with light attached.