Or pay in 3 installments of €76,33 
Power Block Kit FX Impact MKI & MKII FX20839
This Original FX Impact Power Block Kit With 720 Power Plenum Upgrade Set will bring your FX Impact MKI or MKII to a total new level with a total of 72 CC of regulated air and a high flow power block.
FX Impact Power Block Kit With Plenum 720 (72 CC) Upgrade Set
This Power Block kit for the FX Impact M3 is an upgrade which provides improved valve flow and delivers more power, great for use with heavier slugs on long distances.
The FX Impact 72cc Power Plenum adds an extra amount of regulated air what will result in a better efficency of the rifle with higher power levels with a lower regulator setpoint. Of course, you’re still able to reduce the power for lower velocities.
Does your FX Impact MKI/MKII already have a Power Plenum installed? In this case, purchasing just the Power Block kit for FX Impact M3 variant is sufficient.
This Power Block Kit FX Impact MKI & MKII consists of the parts listed below:
• 10337: Valvetube Power Plenum Impact M3
• 10338: Valvetube End, Power Plenum Impact M3
• 20671: Valvehouse, Impact, Big Plenum
• 20271: Hammer weight Big Plenum
• 2604: Hammerspring 52 mm
• 2602: Spring 1×6, 2×45
• 20275: Valve pin Big Plenum complete
• 19726: O-ring 5,5 x 1,5 NBR 70
• 5154: O-ring 16,0 x 2,0 NBR 90
• 5113: O-ring 20,24 x 2,2 NBR 70
• 19768: O-ring 2,84 x 2,62 PUR 90
• 19763: O-ring 9×1,5 NBR 90
• 19616: Valvestop Impact
• 20277: Valve adjuster screw
• 10327: Valve adjuster knob Impact M3
• 19717: Countersunk screw M6x8
• 19722: O-ring 9×1,5 NBR 70
• 19227: Rubber ball 4,0mm NBR75
• 20562: Hammer Impact HP Complete
• 10325: Valve stop piston Impact M3
• 20670U: Rear Block Impact Power 2022 without serial number
• 5110: Rubberball 4,75 NBR75
Specifications
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Shipping and Payment
We ship your items well packed for safe and undamaged arrival in the country of destination with tracked priority shipping (unless this is specifically stated otherwise). As a buyer, you are responsible for checking that this product is legal according to your local laws and regulations. Unless specifically stated otherwise, all our Air Guns, Air Gun Parts and Accessories are supplied in/for high-power versions.
You can pay safely and secure online by means of all major payment providers, like paypal and credit cards companies.
9 reviews for Power Block Kit FX Impact MKI & MKII FX20839
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Gail C. Phillips (verified owner) –
I decided to upgrade my FX Impact MKII by installing the Power Block Kit, FX 20839, purchased from Huma-Air. It was my intention to achieve the same level of performance as an FX MK III. The kit arrived at my doorstep in Texas from the Netherlands within four days of order placement! The package, which was shipped through UPS, looked as if it had been used as a play toy by a gorilla! The box was bent almost in half, had a 1-inch hole poked into one side, and was terribly patched with some crude packing tape! Since the package had been delivered while I was not at home, I was unable to talk to the UPS driver or even refuse delivery. Upon unpacking the contents, the internal FX packing box was also bent almost in half. As luck would have it, all the kit contents were undamaged except for the valve rod which was bent at a 20-degree angle from the threaded end.
Upon contacting Huma -Air about the situation, Dean, from customer service asked me to send some pictures of the damaged box and the bent valve rod. In a timely fashion, Dean had another valve rod shipped to me. When I unpacked the box, which was again shipped by UPS, I found the new valve rod securely attached to a length of 1 x 2 wood board. There was no way for this one to get damaged in transit!
The conversion kit, along with the ordered silicone lube oil, was installed and the now MK III functions perfectly!
The customer service, as demonstrated by Dean’s quick response to my situation, has earned my highest respect! It is indicative of the priority that Huma-Air places on its service to its customers as well as its professionalism as a company!
It is my pleasure to give Huma-Air the highest possible rating it deserves, and I will remain a very loyal customer for future air gun accessories purchases!
lrrp.airgunner (verified owner) –
It is great to upgrade my MK1 with this power kit. Unfortunately, the only issue that I have after putting everything carefully together, the M3 rear power Block doesn’t comes with the screw (behind the Regulator pressure gauge), and the one for the MK1 is too loose or small for the new one. The MK2 screw will fit on the M3 power block but not the one of the MK1. So you can call FX directly and explain to them if they can send one so you can use your new power block otherwise you can’t use your FX impact without that rear screw (behind the Regulator pressure gauge). I watched the video of AirBuks, which shows to use the screw of his MK2 that will fit the new M3 power block, but the screw from the MK1 doesn’t work/fit. The video is a great help because it shows every step if you do it yourself. Besides that, you will be having an excellent upgrade for your FX Impact. My rating is Perfect due to Huma Air excellent customer service. Otherwise almost perfect.
Graeme Dawson (verified owner) –
Number one shop for air rifle 5 star from order to delivery
⭐️⭐️⭐️⭐️⭐️
HUMBERTO LOPEZ (verified owner) –
Fit and work great on my Fx impact MKII
S hudson (verified owner) –
Brilliant piece of kit does what I wanted and excellent service from huma
Ian Woods (verified owner) –
Excellent service and prompt delivery will buy again.
Etienne (verified owner) –
Très bon produit, gain de puissance réel et performance au rendez-vous. Je recommande ce kit
Jari (verified owner) –
Nice kit. Installed mk2
Comes everthing what you need
Jørn (verified owner) –
Had some issues with the plenum end not fitting my old Impact X, but as always, Huma fix! Returning customer for years, all Huma parts I have bought have been high quality, and the customer service outstanding.