FN 5.7 Pistol Barrels2019-03-23T23:59:10-06:00


The original aftermarket threaded barrel for the FN 5.7 Pistol.  Approached by Gemtech in the early 2000’s, we were tasked with developing and manufacturing the first and only threaded barrel for the FN 5.7 available in North America.  From this, the Jarvis FN 5.7 Tactical Pistol Barrel was born.

Made from high strength 4140 Gun Barrel Certified Steel and heat treated to 40-42 HRC for unmatched strength and longevity.  Button rifled to a mirror finish and machined to tolerances of .0005″, the Jarvis FN 5.7 Tactical Pistol Barrel provides the shooter with a high degree of accuracy and reliability, all while shooting suppressed.


FN 5.7 Pistol Barrels
FN 5.7 Tactical Barrels
Brian R.
Purchased a drop in threaded barrel from Jarvis for a Valor and they under promised and over delivered! Match grade stainless barrel is very accurate and I would not hesitate to purchase from Jarvis again...nor should you!
Neil S.
Very nice quality barrel. Fit and finish are excellent and the estimated time to deliver very was accurate. Great company to do business with.


For almost 40 years we have been the leader in precision and accuracy.  We do not compromise, and we demand perfection from ourselves because we believe that’s what our customers deserve.  In the early 2000’s we were approached by Gemtech to develop the first threaded barrel for the FN 5.7 available in the United States.  Shortly after the Jarvis FN 5.7 Tacitcal Pistol Barrel was born.  Our extensive background in manufacturing and gunsmithing has made us the industry standard for aftermarket barrels.

What separates us from the pack?  It starts with the steel.  Our FN 5.7 pistol barrels are manufactured from 4140 Gun Barrel Certified Steel made in the USA and nowhere else.  This carbon steel provides outstanding strength and thermal characteristics which provide phenomenal longevity and performance under high heat and stress.  Our proprietary rifling process is done by rifling machines designed by us to ensure bore and groove dimensions are held to .0005″ tolerances and do not vary over the length of the barrel.  This button rifling process produces a mirror like 4 to 6 micron finish.  Every process, from drilling and rifling, to turning and milling is carried out by our experienced machinists and gunsmiths.

At Jarvis, Inc. we believe that our experience and attention to detail are producing the finest aftermarket FN 5.7 barrels available.  With honesty and integrity, we strive to serve our customers to the best of our ability on a daily basis.  The price may be higher, but at Jarvis, Inc. you get what you pay for.  Quality, accuracy, and people who care about your experience.


Our FN 5.7 Tactical Pistol Barrel will fit all models of the FN 5.7.  Whether you have the older IOM or USG, or the newer MK2 this barrel will fit and function in your pistol.  With a 1/9 twist rate and conventional rifling, the Jarvis barrel for the FN 5.7 produces excellent groups for the platform. 

The feed ramp and chamber are polished by hand to minimize friction and maximize function.  A shiny black oxide finish gives the barrel an aesthetically pleasing appearance and protects the steel from corrosion.  The recoil spring weight is the same as factory with light weight spring options available.


A somewhat common question we receive is why a thread adapter is necessary and why do we not machine the barrel with the 1/2-28 thread which is now standard for .22 caliber suppressors.  The FN 5.7 barrel has a very small outer diameter as the corresponding hole in the slide is far smaller than other semi auto pistols that utilize the 1/2-28 thread (primarily 9MM). 

Due to the barrel diameter being much smaller than 1/2″, it is not possible to machine the 1/2-28 thread on the barrel.  For this reason, FN chose the 10x1mm Right-Hand thread to be the standard for the FN 5.7.  As a result, the Jarvis FN 5.7 Thread Adapter is required to attach any 1/2-28 threaded suppressor.