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Disclaimer What I do with my gun may void the factory warranty, and/or pose risks to property damage or personal injury. The outcomes of what I do with my gun may differ in your case! Overview A little expensive for an air pistol, and some people will be quite annoyed or frustrated by the gun...

In terms of using the right ammos, @Devink is correct! The following ammo types have worked well for me: JTS 22gr .22 pellets (harder lead alloy, stout pellet) HN Field Target Trophy Green lead-free .22 pellets (<9.6 gr!) GTO .22 lead-free pellets (expensive) AVS 22gr .223" slugs (2 MOA groups...

This happened to me a few times. Here is how I fixed the problem. Put the safety on! Completely degas the gun. There are a few YouTube videos showing how to do this. A jam typically let some air out, but not necessarily emptying the air reservoir. Remove the shroud using a 7mm hex key to remove...

You're welcome! I also found that it is more effective to apply 30 weight silicone oil directly on the 3rd stage rod and the inner portion of the first stage tube. Dropping silicone oil via the air intake hole does not seem to lubricate as effectively. To lube like this, only the top part...

Just received and installed this from Ethan Cobb today. The precision and workmanship of this bottom rail is impeccable. It is a precise fit on the trigger guard. I cannot be happier with this purchase. The rail is a milled aluminum piece, and it is stout! The Arca adapter slides in perfectly.

The most pronounced sound from the action is, surprisingly, the magazine cycling. The volume seems to correlate with the power level. The key to keep the gun quiet is energy level and a good LDC. I have tested the skinny (30mm) Huma, an oversized Clague, and even home-made 3D printed ones, all...

@primaz , I have no experience with the .25 version of GTO pellets. However, I can share what I know about the .22 ones. The GTO pellets are lead-free. They are light and made of a hard alloy. In .22, these pellets fit the magazine well and do not jam. Turning down the power setting, these...

...with lighter pellets. All of these observations are consistent with the theory that it takes a flow of about 400 cubic inch per second (870 FPS * 12 in/ft * 0.11 in^2 * 3.14) to have any significant effect on the closing valve actuating faster. It'll be interesting when the .177 version is...

The Dragonfly Mk2 seems to share the same basic platform as the Artemis PP900 guns. If the barrels are similar, JSB Exact Heavies are a good starting point. They have a relatively high BC. 12 FPE at a closer range like 20 yards will pass through a squirrel in a body shot using said pellets.

After much experimentation, I have come to the same conclusion that the GK1 is best shooting pellets and not slugs. Mine is in .22, but the issues are similar with the .25 version. As a last ditch attempt, I have ordered some .219 hollow base slugs from AVS. I am not holding my breath. Now...

...with a ball bearing at the tip. That improves the trigger quite significantly. The regulator is adjustable, but not the HST. The hammer spring is *way* too strong for me, so I collapsed a few coils. This has another beneficial side effect, the hammer is now free flying, there is no burp...

Thanks for the confirmation. The valve design seems to have an intrinsic flat shot curve at around 800 to 900 FPS, regardless of projectile weight. This gun, especially when unregulated, is definitely not for slow muzzle velocities!

@wimpanzee ,I am curious how you set up the power setting and the pressure range that you use. I have been trying to set up for shooting GTO pellets at a lower speed, but I could not get a flat or bell-shaped shot string. The shot strings that I have so far are always tapering down. I agree...

The thread is M10x1mm, male on the hose, female on the probe. This appears to be a fairly common size for foster quick-connect fitting, Amazon has it. Yes, the package includes a full rebuild kit. I contacted Huben before purchasing to make sure additional rebuild parts can be purchased. Check...

I just got some GTO pellets today and I just ran a chrony session. Perfect timing to check out the number of strokes to pump the GK1 back up! I shot the GK1 down to 200 bars. It takes 5 strokes to fill the hose to 200 bars. It took about 20 strokes to fill to 250 bars. Then 14 more to fill to...

Thanks for all the recommendations!

I know what you are talking about! I can use a micrometer to check the exact sizes of the smaller ones, or just feel the snugness of the fit if I ever need to use them. I already have a set of small keys from 0.7mm to 2mm for match trigger adjustments.

Cheap hex key set from Amazon. What is interesting about this set is that it includes some odd sizes, such as 7mm, and all the way down to 0.7mm on the metric side. I cannot speak to the quality of the material, but "it works." The keys do not have ball ends. Even so, for $14 shipped, I have...

Sure thing! I think it is capable of pumping to 3500 psi due to a very thin 3rd stage cylinder. This means the volume per stroke may be less than other hand pumps. Given the smaller air cylinders of the guns that I intend to pump, this is not a major issue. The HB35 is also surprisingly light...

...I have read that this is also the same fill probe for Diana Bandit/Stormrider (aka Artemis PP800(R), etc.). Great, as I have a PP800R that will be *so easy* to pump to 200 bars! After inserting the fill probe insert, I only had to hand tighten the fill probe to the hose, no tools! Read the...