A king is born.

With the all-new FX King we strive to keep pushing boundaries and keep innovating in many different ways. The FX King is a powerful and pure hunting rifle ready to dominate the hunting fields.

At its core the FX King inherits the same true and tested block of the Panthera/Dynamic that’s capable of delivering a huge amount of power and energy. The FX king is an awesome pellets shooter without a doubt, but where it really excels is shooting slugs, thanks to its slug-based design and innovative valving. All while maintaining a slim and beautiful look as it sits in a custom-tailored GRS stock.

With the large innovative over the barrel plenum system like you can find on other FX models the FX King can use the big volume to its advantage. Whether you want to shoot pellets or heavy slugs the FX King can handle it all while maintaining a sleek look in a traditional sporter stock.

Dual angled high precision Wika gauges set to monitor the bottle and regulator pressures. This way you can keep track at both pressures while shooting, even from the shouldered position out hunting. All so you won’t miss that all so important shot.

It is impossible to imagine a powerhouse like the FX king without the ability to tune it the way you want. Therefore, the quick tune system was a must and is seamlessly integrated into the ergonomic GRS rifle stock. Adjustments can be made quick, repeatable, and precise.

Even though this is a very classic sporter rifle we know you would love to mount accessories. So we have created accessory picatinny rails on both sides of the FX King with the possibility to mount flash- lights, bi-pods and more.

With the deep magazine design adopted from the Panthera/Dynamic, the King can handle any kind of ammunition you throw at it up to 13 mm in length, pellets of any kind , shorter lighter slugs or heavy longer slugs are no problem.

All that topped with a picatinny scope rail that is 30MOA angled allowing you to have more usable elevation adjustments on your scope and reach out to longer distances with ease.

The King sits in a custom-tailored GRS stock, just like you would expect a King to wear a fine tailored suit. Available in three gorgeous color options.

The Norwegian stock making company GRS builds highly adjustable ergonomic laminate stocks with features like tool-less adjustments, a broad for-end and an ergonomic GRS grip, offset and angled, offering unsurpassed shooting comfort making the King stand-out among the rest!

The FX King comes to you in a nice hard-case with custom cut foam that fits like a glove protecting your new rifle in transport and storage.

Note: Muzzle energy listed in the specifications of each rifle is for maximum setting. Due to differences in regulations the rifle is often produced with a lower muzzle energy from the factory. Contact your dealer for more info about muzzle energy in your region.

Cocking system Right hand positioned sidelever with an ambidextrous mount to be able to relocate sidelever on left side for lefthanded shooters (depending on stock).
Magazine type Removable high capacity, easy load.

Newly developed deeper lid to accommodate longer length slugs.

Maximum ammunition length, 13 mm (0,51”)

Made in durable injection-moulded POM

21 shot when Cal .177
18 shot when Cal .22
16 shot when Cal .25
13 shot when Cal .30
10 shots when Cal .35

Stock GRS Laminate stocks.

– Adjustable cheek piece

– Adjustable recoil-pad

– Tool-less adjustments

– Ergonomic grip

Also available in left-handed version.


Green Mountain Camo

Nordic Wolf Laminate


Calibre 4,5 (.177)

5,5 (.22)

6,35 (.25)

7,62 (.30)

9,00 (.35)

Barrel 500:

Superior STX barrel liner.


Superior Heavy STX barrel liner.

Shot capacity 500:

4,5 (.177) N/A

5,5 (.22) 180 shots with 15.89 gr pellet at 900 fps

6,35 (.25) 90 shots with 25.39 gr pellet at 900 fps

7,62 (.30) 70 shots with 44.75 gr pellet at 860 fps

9,00 (.35) 30 shots with 81 gr pellet  at 840 fps


4,5 (.177) N/A

5,5 (.22) 128 shots with 22 gr hybrid slug at 900 fps

6,35 (.25) 96 shots with 26 gr hybrid slug at 900 fps

7,62 (.30) 56 shots with 44,5 gr hybrid slug at 900 fps

9,00 (.35) 26 shots with 68 gr hybrid slug at 900 fps


Fill pressure Max 250 bar (3625 psi)
Safety Switch style
Optics Picatinny rail with built in 9 MIL/30 MOA angle

Marked with figures on the right side for easy repositioning of optics.

Muzzle Built-In Shroud system (variations may occur depending on country).
Pressure gauge Dual Angled Gauges:
Air tube pressure WIKA
Regulator pressure WIKA
Trigger Adjustable Match Trigger

Trigger blade can be adjusted in reach, height and rotated to set the blade in an angle.

Velocity N/A
Energy 500:

4,5 (.177) N/A

5,5 (.22) up to 70 ft/lbs with 34gr slug at 960 fps

6,35 (.25) up to 80 ft/lbs with 43.5gr slug at 910 fps

7,62 (.30) up to 113 ft/lbs with 64gr slug at 890 fps

9,00 (.35) up to 135 ft/lbs with 81gr pellet at 865 fps


4,5 (.177) N/A

5,5 (.22) up to 82 ft/lbs with 34gr pellet at 1040 fps

6,35 (.25) up to 91 ft/lbs with 43.5gr slug at 970 fps

7,62 (.30) up to 130 ft/lbs with 64gr slug at 1020 fps

9,00 (.35) up to 173 ft/lbs with 93gr slug at 915 fps

Note: above figures are maximum FAC Power output using tungsten hammer.

Air capacity 480 cc air cylinder + plenum volume
Air cylinder Carbon fibre wrapped air tank, removable.
Length 500: 970 mm
600: 1075 mm
Weight 500: 3,45 kg
600: 3,6 kg
Charging Rear Foster Quick Disconnect, dust cap included.
More features AMP MkII Regulator

Externally Adjustable

Quick Tune System

Micro and macro adjustment of hammer spring tension

Dual accessory rails.

Picatinny on both sides. 


Comes delivered in a tailored cut out case.

Plenum 500: Macro Plenum – 62 cc
600: Magnum XL Plenum – 156 cc