Precision Barrel Enhancement for All FN Five-seveN® Models
Upgrade your FN Five-seveN pistol with a precision-engineered 5.5″ EFK Firedragon threaded barrel. CNC-machined from 416R stainless steel and vacuum heat-treated to 40–42 Rc, this barrel delivers improved accuracy, longevity, and consistency across all generations— IOM, USG, MK2, and MRD/MK3. Designed as a true drop-in fit, no gunsmithing or fitting is required.
Key Features
- True drop-in fit for IOM, USG, MK2, and MRD/MK3 variants
- Threaded muzzle: 10×1 mm RH with included thread protector
- Adapter included: converts 10×1 mm RH to ½×28 RH for wider suppressor compatibility
- 416R stainless steel, conventional button-rifled 1:9 twist
- Vacuum heat-treated 40–42 Rc for consistent hardness and long service life
- Made in the USA
Suppressor-Ready Design
This barrel is suppressor-ready out of the box. The native 10×1 mm RH thread pattern supports European and factory-style 5.7-rated suppressors, while the included ½×28 adapter ensures compatibility with most U.S. muzzle devices and 5.7-rated suppressors. Always verify that your suppressor is rated for 5.7×28 mm pressures before use.
Break-In and Maintenance
Fire approximately 150 rounds of quality factory ammunition before installing any muzzle device. Clean with non-chlorinated solvent after each session for consistent performance and accuracy retention.
Specifications
- Length: 5.5″
- Primary Thread: 10×1 mm RH
- Adapter: Converts to ½×28 RH
- Material: 416R stainless steel
- Twist Rate: 1:9
- Rifling: Conventional, button rifled
- Hardness: 40–42 Rc
- Thread Protector: Included
Installation
Drop-in replacement. Remove the factory barrel and install this unit—no fitting or gunsmithing required. Pair it with our Five-seveN accessories for optimal performance.
Safety Notice
Due to the high velocity of 5.7×28 mm ammunition, use only new, factory-loaded rounds. Reloaded ammunition is not recommended.
