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The FX King PCP Air Rifle with GRS Hunter Brown stock builds on the legacy and technological innovations of past FX air rifles to create an instant classic. With a focus on maximizing hunting results, this airgun includes the renowned FX tuning adjustments that help shooters get the best performance possible for a specific projectile and situation.
This airgun has a Hunter Brown stock from Norwegian stock makers GRS that offers tool-free adjustments such as an adjustable rubber recoil pad and an ambidextrous adjustable cheekpiece, in addition to the angled and offset ergonomic GRS grip. The air rifle also provides a number of adjustable features, including the two-stage adjustable match trigger and Quick Tune System for macro and micro adjustments to the hammer spring tension.
The 500 model of this air rifle uses a barrel with a Superior STX barrel liner, and the 600 model uses a Superior Heavy STX barrel liner, both of which produce accurate shots and balance a high shot count with impressive power. This combines with the improved valving compared to older designs and allows it to excel at using both pellets and slugs, a versatility that is especially useful for hunting.
The FX King comes with dual angled WIKA gauges on the block, which makes it very easy to monitor both the bottle pressure and the regulated pressure without having to move or turn the air rifle. The AMP MKII regulator works in concert with the over-the-barrel Dynamic Plenum and the Dynamic Block to provide incredibly consistent performance from each shot every time.
The Picatinny optics rail on this air gun includes a 30 MOA (9 MIL) angle to deliver improved long-range accuracy, and it has markings on the right side of the rail to help with quickly repositioning optics. The air rifle also has Picatinny accessory rails on both sides of the forearm for adding items such as lasers and lights.
To get an airgun with a host of adjustable and smart tuning features with a custom GRS stock and the power and accuracy to make any hunting trip a success, buy the FX King PCP Air Rifle with GRS Hunter Brown stock at Pyramyd AIR today.
FX King PCP Air Rifle, GRS Hunter Brown
- Reversible sidelever (with compatible stocks)
- GRS Hunter Brown stock
- Removable 480cc carbon fiber wrapped bottle
- 62cc Macro Plenum (500), 156cc Magnum XL Plenum (600)
- High-power, short impulse valve Dynamic Block
- Over-the-barrel Dynamic Plenum design
- Quick Tune System
- Fill pressure: 250 BAR/3,625 PSI
- Shots per fill (500)*: 180 (.22), 90 (.25), 70 (.30), 30 (.35)
- Shots per fill (600)*: 128 (.22), 96 (.25), 56 (.30), 26 (.35)
- Max. energy (500)**: 70 FPE (.22), 80 FPE (.25), 113 FPE (.30), 135 FPE (.35)
- Max. energy (600)**: 82 FPE (.22), 91 FPE (.25), 130 FPE (.30), 173 FPE (.35)
- Magazine capacity: 21 (.177), 18 (.22), 15 (.25), 13 (.30), 10 (.35)
- Standard Side Shot magazine with deeper .51" lid for longer slugs
- Superior Smooth Twist X barrel
- Superior STX barrel liner (500), Superior Heavy STX barrel liner (600)
- Adjustable hammer tension power wheel
- AMP MKII (Adjustable Match Precision) regulator
- 2-stage adjustable match trigger
- Dual angled WIKA gauges: bottle and regulated pressure
- Picatinny optics rail with 30 MOA/9 MIL angle
- Dual Picatinny forearm accessory rails
- Angled offset ergonomic GRS grip
- Tool-free adjustable rubber recoil pad
- Tool-free ambidextrous adjustable cheekpiece
- Foster Quick-Disconnect fill port with dust cap
- Manual switch safety
- Barrel length: 500mm/19.685" (500), 600mm/23.6" (600)
- Overall length: 38.2" (500), 42.3" (600)
- Weight: 7.6 lbs. (500), 7.9 lbs. (600)
- Includes tailored cut-out case
* - Using: For 500: 15.89gr pellets at 900 FPS (.22), 25.39gr pellets at 900 FPS (.25), 44.75gr pellets at 860 FPS (.30), 81gr pellets at 840 FPS (.35). For 600: 22gr hybrid slug at 900 FPS (.22), 26gr hybrid slug at 900 FPS (.25), 44.5gr hybrid slug at 900 FPS (.30), 68gr hybrid slug at 900 FPS (.35)
** - Using tungsten hammer and: For 500: 34gr slug at 960 FPS (.22), 43.5gr slug at 910 FPS (.25), 64gr slug at 890 FPS (.30), 81gr slug at 865 FPS. For 600: 34gr pellet at 1040 FPS (.22), 43.5gr slug at 970 FPS (.25), 64gr slug at 1020 FPS (.30), 93gr slug at 915 FPS (.35)
Specifications
Ballistic & Conversion Calcs
Overall Rating
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2 of 2 FX Airguns King Hunter Brown Reviews
Power and accuracy is incredible. Sexy looks help the hefty price tag.
Things I Would Have ChangedWould like to see it come with maybe 50 pellets.
What Others Should KnowOne of the best rifles in the FX lineup.
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By leveraging our expertise and precision, we ensure that your equipment is finely tuned to meet your specific needs and get you ready for your outdoor pursuits. So look out for our services when shopping for something new, and let our experts help you get the most from your outdoor adventures.
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May 12, 2026
By P M
The air rifle is great. Very accurate and easy to operate. But..!
Things I Would Have ChangedI purchased the new King in late February, this year. As you probably know, it is NOT a cheap Air Rifle! The air rifle is leaking pressure. Each shot bleeds 10 to 25 bar pressure out of the tank. When the rifle sits, the tank pressure progressively decreases. Pyramyd Air won’t do anything about it, because it’s more than 30 days from the purchase. FX wants me to FedEx the rifle to California, in order for the rifle to get serviced, under warranty. They issued a FedEx label, but no insurance for the package, plus I have to depressurize it and find a box big enough to package the rifle’s case, with the rifle in it, without any attachments on it. These size boxes are priced between $58 and $95, which they’re not covering. At this point, I asked them to send me a new one and when I get it, I will use the packaging, to send the leaky rifle back. Still waiting for their reply.
What Others Should KnowIt is very upsetting to spend this kind of money on an air rifle and have it not working as promised. Its looks and functionality are superb, but the leak, leads me to believe that it was assembled wrongly. Not good.