FN 5.7 MKII/MK3 Threaded 10x1mm RH 5.5" with adapter

Twist Rate: 1/9 -Rifling: Conventional, Button Rifled -Material: 416 R Stainless Steel -Hardness: 40-42 Rc -Threads: 10x1mm Right Hand -Thread Protector: Included at no extra charge -Adapter: Included at no extra charge from 10x1mm RH TO 1/2X28RH SAFETY NOTICE: Due to the high-velocity of the 5.7x28mm round, we strongly recommend the use of new factory loaded ammunition only. Any use of reloaded ammunition is strongly discouraged.

NOTE: THE OLD 5.4" BARREL WILL NOT WORK IN THE NEW MK3/MRD MODEL

EFK Fire Dragon Threaded Barrels
THESE ARE SOME OF THE FINEST PISTOL BARRELS MADE IN THE WORLD!
Because of the care exercised in manufacturing and our refusal to compromise on any step of the process.

• We use the finest material available (type 416 Stainless Steel)
• Machining processes are accomplished on CNC equipment for close-tolerance production.
• Heat treating is done in a vacuum furnace for clean, consistent hardness of 40-42Rc

The end result is a good-looking, top-quality barrel with consistent, accurate and long-lasting performance. And don't forget the service. We deal with our customers on a personal level to ensure their complete satisfaction on all of our products.

All threading barrels come with a thread protector.

Industry standard is 150 rounds to break in a barrel before threading any device on to the barrel.