Yes. They refer to the same brand. HUBEN is the English brand name, while Huben's Chinese name is commonly used in Chinese-language markets and player discussions. Different spellings mainly come from transliteration, language context, and usage habits.

Yes. HUBEN PCP airguns are manufactured in mainland China. They are assembled and quality-controlled according to the brand's standards, and most products are sold primarily for overseas markets.

In general, the K1 can be divided into two main versions: the early version and the later version. The early version generally refers to units produced up to early 2020. The later version is usually called the 2020 version or post-2020 version. The most important 2020 change was the new barrel. This barrel uses a non-choked design and was optimized specifically for the K1's direct magazine-feeding structure, helping it achieve excellent accuracy with both pellets and slugs. The latest version performs well across all power ranges, while the early version was especially strong at higher power settings. Huben has also continued improving production processes and quality control, so small improvements may exist between batches. These are gradual refinements and do not fundamentally change the core structure or function.

Both versions use the same core platform, including the internal structure, barrel, air reservoir system, pressure gauge, and overall performance. The main differences are appearance and material. The wood stock version uses a carbon-fiber moderator shell, which makes the overall weight lighter. This can feel somewhat unexpected on the wood stock model. Another small difference is the position of the moderator vent holes. On the wood stock version, the vents are positioned farther back and closer to the shooter, so the shooter may perceive it as louder. From the front of the muzzle, however, the wood stock version is actually quieter. Note: later synthetic stock versions also adopted the rear vent-hole design.

Yes. Although direct magazine feeding can theoretically be challenging for slugs, the latest K1 handles them very well. As with any airgun, testing is still needed to find the best slug for a specific gun. If you do not want to spend a lot of time testing, these proven choices are good starting points: .22 caliber: Zan .219 in 22gr and 28gr; EDgun / JSB Knockout Slugs MKII in .216. .25 caliber: Zan .253 in 33gr and 38gr; EDgun / JSB Knockout Slugs MKII in .250. These slugs usually perform reliably in the K1.

The hammerless design means the trigger acts directly on the valve stop mechanism instead of using a hammer to strike the valve. The valve is opened directly by pressure from the regulated chamber acting on the piston. Because no hammer is needed to overcome valve resistance, this structure brings several advantages: Fewer moving parts. Significantly reduced vibration, which helps improve accuracy. Higher energy efficiency. Greater output potential. This operating method also gives the K1 high reliability and smooth feeding rhythm. Accuracy, power, and reliability are the direct benefits of Huben's hammerless system.

Structurally, the GK1 can be seen as a smaller version of the K1, changing from a rifle format to a pistol format. Their core mechanical structures are almost the same, with only minor differences, and many parts are interchangeable. The GK1 uses a shortened version of the K1 barrel. The main difference is that the factory GK1 is designed without a regulator, meaning it is an unregulated platform.

Yes. The GK1 has adjustable power. A screw inside the grip can increase or reduce velocity, thereby adjusting output power. This screw controls the valve opening time: Turn counterclockwise: increase power. Turn clockwise: reduce power. Because the GK1 has no regulator, this is its only power adjustment method. As an unregulated PCP airgun, its output is also affected by fill pressure: higher pressure means higher power. As shooting continues and pressure drops, power gradually decreases, but the drop is relatively smooth. The valve compensates for falling pressure by staying open longer, so the GK1 is noticeably more stable than typical unregulated PCP airguns. Power settings should always match the current air pressure. It is not recommended to let pressure fall below 150-160 BAR, as excessive valve opening time may cause abnormal behavior or even release all remaining air at once. With heavier projectiles, a higher minimum refill pressure, such as 180 BAR, is recommended.

Power adjustment should be gradual and done with a chronograph, so velocity data can be monitored in real time. The adjustment screw has no mechanical stop and can theoretically be removed completely, but this should be strictly avoided. The official recommended maximum adjustment range is 2 turns, or 720 degrees. For maximum output, it may be adjusted up to 2.5 turns, but the gun must be refilled in time when pressure drops to no lower than 220 BAR to ensure safety and reliability.

Yes. The GK1 can use slugs normally, but the slug size must match the caliber. Recommended sizes: .22 caliber: at least .219. .25 caliber: .253 / .254. Correct sizing helps ensure accuracy and stability.