SKU: 97601428979

F2™ HPA Conversion Kit

Sale price$190.35 Regular price$211.50
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Ships within 48 hours · Estimated delivery Aug 7 - Aug 12

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Description

F2™ HPA Conversion KitBite Sized Fusion Engine Winner of the "Best HPA Engine" in the 9th Airsoft Players Choice Awards, the dual solenoid design of the F2 provides the same functionality as the legendary Fusion Engine but in a more compact, efficient and flexible design. Dual solenoids allow for the nozzle and the poppet valve to be adjusted independently of each other for unparalleled control over both the loading time and air volume used. Additionally, this makes it

 

Bite Sized Fusion Engine

Winner of the "Best HPA Engine" in the 9th Airsoft Players Choice Awards, the dual solenoid design of the F2™ provides the same functionality as the legendary Fusion Engine™ but in a more compact, efficient and flexible design. Dual solenoids allow for the nozzle and the poppet valve to be adjusted independently of each other for unparalleled control over both the loading time and air volume used. Additionally, this makes it possible to change the firing sequence giving it the ability to operate in both true closed bolt as well as "AEG" mode. (PolarStar Filter Fitting now included)

The F2™ incorporates a new one-piece, lightweight poppet valve design yet still operates on the same principle as the Fusion Engine™ poppet. This valve is able to operate at lower pressures and uses less air volume to function which optimizes air efficiency.

A robust design allows for an operating pressure range of 45psi to 145psi which enables the F2™ to achieve velocities from CQB to DMR while employing only one nozzle for the entire velocity adjustment range.

Additionally, its nozzle is spring biased forward which provides a consistent loading force regardless of operating pressure. It shares the same spring as the Fusion Engine™ with both light and heavy spring options available to adjust the loading force.

Gel Ball Compatible

F2 HPA conversion kits can also be configured for use in gel ball systems.

Please contact us for information on ordering F2 systems for gel ball use.

 Velocity: 480fps w/ .20g @ 145psi
The F2™ allows for easy velocity adjustment just by changing input pressure and does not require different nozzles to reach its full velocity range. Using a standard M4 as an example, velocity can be adjusted from below 280fps and up to approximately 480fps with a .20g BB. Velocity can vary per model as longer barrels will increase the maximum velocity while shorter barrels will decrease it. 
ROF: 30rps
The maximum cyclic rate of the F2™ is affected by several factors such as the operating pressure as well as quality of the magazine and BB's used. However, 30 rounds per second is achievable in most standard configurations.
Air Efficiency: 1000+ shots from 13/3000 @ 1.5J  w/ .28g
The standard F2™ poppet valve is equivalent to the Red Low-Flow poppet of the Fusion Engine™. However, this valve responds faster and requires less air volume to operate so the F2™ is able to achieve greater air efficiency than even a finely tuned Fusion Engine™.
(Test Configuration: Red Poppet / 6.05x375mm Barrel)

 

**All kits come with a Filter Fitting installed, FCU, Switchboard, Wire Harness and any additional components needed to convert the specific airsoft rifle model for which the kit is configured. The HPA Tank, Air Rig (regulator and line) and Battery needed to operate the system are purchased separately.**

 

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 97601428979

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Spring Fire
Houston, US
★★★★★ 5
My dog loves these
I'm a repeat customer, my dog loves these
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Reviewed in the United States on May 13, 2026
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Suzanne
Alexandria, US
★★★★★ 5
Every dog I’ve ever heard of loves these.
Style: Medium, Size: 10 Chews
The only thing my dog likes better is hooves. These are better by far for dogs.I feel good about the health benefit. This certain one in fact. Pricey but if your dog isn’t big they last a long time. Weeks or a month for my 12# dog. Subscribe and get in bulk. We had a 45# dog (since passed) If you give it to your dog for a period of time then remove it you can make it last longer. NEVER give a smaller one for their weight but you can go bigger. You don’t want choking hazard. I’ve never heard of any dog ever that didn’t want it. They may immediately love it or let it sit a few days wondering but once they start? They’ll guard it and go crazy.
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Reviewed in the United States on April 17, 2026
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Helen
Draper, US
★★★★★ 5
Great chews that last a long time
Style: Small, Size: 5 Chews
My pug loves these chews!
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Reviewed in the United States on June 10, 2026
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Paola Polanco
Los Angeles, US
★★★★★ 5
Perfect for aggressive chewers — my dog loves them!
Style: Medium, Size: 3 Chews, Style: Medium, Size: 3 Chews
I’m so impressed with the Native Pet Yak Cheese Himalayan Dog Chews! My pit-bull (Queen) is a medium-sized dog who is an aggressive chewer who usually destroys treats in minutes, but these last a long time and keep her completely occupied. They’re 100% natural, have no weird smell, and don’t leave any mess behind. I also love that they help clean her teeth while she enjoys them. It feels good knowing she’s getting something healthy and satisfying at the same time. Definitely a must-have for any dog owner looking for durable, natural chews — I’ll be buying more!
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Reviewed in the United States on November 2, 2025
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A.G.
Birmingham, US
★★★★★ 4
A bit disappointed in our most recent order.
Style: Large, Size: 3 Chews, Style: Large, Size: 3 Chews
**update 11/15** Native Pet reached out directly and offered a full refund. I appreciate that they took my feedback seriously and took steps to resolve the issue. We love Native Pet and have gotten several other products that our pup not only enjoyed but also all did what they say they do. Native Pet does make high quality goods for pets and we will continue to be customers. I did not enjoy writing my 3 star review but I wanted to make sure that the brand that we love was aware we didn’t get what we were expecting for the first time in over a year of purchasing. I’m upping my review to 4 stars, but please know that these yak chews are seriously amazing if you can ensure you get the right size for your dog!! —Prior review— Before our most recent order I would have given these 5 stars. We have been buying these yak chews since we adopted our rescue girl in July 2022. These are by far the best “bones” we have been able to find since they are fully edible and can transform into crunchy treats when they get to the end of their life, and they do not upset our baby’s tummy. We love these and have the 3 pack on auto ship. However, our most recent order received on 11/9 is a disappointment. We originally bought the medium chews when we first got our dog because she is medium sized and 45-50lbs, but she turned out to be a big chewer. The medium were too small for her and she was able to bite off large chunks and go through them too fast. We switched to the large which have always been thicker and just a little bit longer so she went through them a little slower and couldn’t get as many big chunks off. Our 11/9 order contained what appears to be the same size as the medium chews, which we don’t get anymore for the reasons stated above. I added a photo of what we received next to pieces left from our prior order. You can clearly see the pieces from the prior order are thicker (circled in green). I didn’t spend $28 to get medium sized yak chews. I understand they can all be slightly different sizes even within the same package, and we sometimes get thicker/thinner/darker/lighter chews, but these are just very SMALL compared to the other large chews we’ve received over the past year. It seems strange that I would suddenly need to start purchasing the extra large chews to get the same substantial size as the large ones I was getting before, unless there’s been a change in the product design itself. I really hate leaving negative reviews. I prefer to only leave reviews when I have a great experience because I think it’s important to share those things rather than complain. If I really have an issue, I usually reach out to the seller if I can. In this case, I can’t find a way to contact the seller to ask if there was a change in the product or if this was an error but I guess I can go through an Amazon customer service rep if needed. This product can’t be returned which is typical of food-like items, but I would like to know why this order seems so inconsistent from what we’ve gotten in the past.
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Reviewed in the United States on November 9, 2023

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