Just received it from Ares Airguns Tactical today. I left the GK1 at about 260 bars after the last session, just so that I can test the HB35 for filling it back to 350 bars.
I have tried this with my Hill Mk4. The Mk4 can barely fill to 250 bars. There is no way that it can fill to 350 bars!
The Huben HB35 is marketed for Huben guns only. As such, it comes with just a fill probe for the K1 and the GK1. 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 instructions about how to lube the pump. It mentioned the use of Magnatec engine oil. I looked that up, it is a Castrol engine oil. Hmmm. Maybe Huben knows something that I don't, but using engine oil in an HPA situation seems counter-intuitive to me due to two reasons: o-rings and self-detonation. Maybe this is a synthetic oil that is engineered to work well o-rings, and maybe it has a very high self detonation temperature. At any rate, I don't have any, so I used regular silicone oil, instead. Another source, Airgun 4 Patriots, suggests any non-detergent SAE 30 engine oil.
Looks like HPA hand pump lubrication is a rabbit hole.
Anyway, back to pumping. I can say for sure that this pump is capable of pumping to 350 bars and beyond (just don't!). I weigh 190 pounds, but not muscular. I have a desk job, not a health nut, and I still don't have a problem pumping. Sure, the GK1 has a tiny air cylinder, as with most of my other guns. But the point is that the HB35 is designed to pump to 350 bars.
Will I pump a 500 cc tank gun from 150 bars to 250 bars? Probably not, unless it is an emergency. However, pumping my micro-carbines (Leshiy classic, PP800R, Brocock Ranger XR, etc.) is a total yes. I am saving the Mk4 for up to 200 bar pumping. The HB35 is mostly for the GK1 and Artemis guns with the same fill probe.
Now, back to the rabbit hole of pump lube!
I have tried this with my Hill Mk4. The Mk4 can barely fill to 250 bars. There is no way that it can fill to 350 bars!
The Huben HB35 is marketed for Huben guns only. As such, it comes with just a fill probe for the K1 and the GK1. 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 instructions about how to lube the pump. It mentioned the use of Magnatec engine oil. I looked that up, it is a Castrol engine oil. Hmmm. Maybe Huben knows something that I don't, but using engine oil in an HPA situation seems counter-intuitive to me due to two reasons: o-rings and self-detonation. Maybe this is a synthetic oil that is engineered to work well o-rings, and maybe it has a very high self detonation temperature. At any rate, I don't have any, so I used regular silicone oil, instead. Another source, Airgun 4 Patriots, suggests any non-detergent SAE 30 engine oil.
Looks like HPA hand pump lubrication is a rabbit hole.
Anyway, back to pumping. I can say for sure that this pump is capable of pumping to 350 bars and beyond (just don't!). I weigh 190 pounds, but not muscular. I have a desk job, not a health nut, and I still don't have a problem pumping. Sure, the GK1 has a tiny air cylinder, as with most of my other guns. But the point is that the HB35 is designed to pump to 350 bars.
Will I pump a 500 cc tank gun from 150 bars to 250 bars? Probably not, unless it is an emergency. However, pumping my micro-carbines (Leshiy classic, PP800R, Brocock Ranger XR, etc.) is a total yes. I am saving the Mk4 for up to 200 bar pumping. The HB35 is mostly for the GK1 and Artemis guns with the same fill probe.
Now, back to the rabbit hole of pump lube!