Huben Gk1 fill and shoot psi

Like longdog, I have shot thousands through my 25 cal. GK1s. I charge to 300 bar and shoot one mag (17) and recharge. After one mag, the tank pressure is about 210 bar. Both of my GK1s are set to 710 fps. Both guns appear happy at that power setting with very consistent velocities and accuracy. These guns will shoot one ragged hole at 25 meters. I don't, I shoot consistent 1" groups off hand at that distance. I shoot every day at least one mag. I charge the guns out of a 12 liter bottle and recharge that to 300 bar about once every 10 days.
 
Like longdog, I have shot thousands through my 25 cal. GK1s. I charge to 300 bar and shoot one mag (17) and recharge. After one mag, the tank pressure is about 210 bar. Both of my GK1s are set to 710 fps. Both guns appear happy at that power setting with very consistent velocities and accuracy. These guns will shoot one ragged hole at 25 meters. I don't, I shoot consistent 1" groups off hand at that distance. I shoot every day at least one mag. I charge the guns out of a 12 liter bottle and recharge that to 300 bar about once every 10 days.
Is yours a shorty or a standard? That seems like a low shot count at those speeds from that fill
 
So since these have to be filled so high does that eliminate the practical use of filling with a portable tank?
Any of you using tanks to fill your gk1? If so what size tank and how many fills are you getting?
If you had read all my statements you would know the answer to your question. For your sake, I will restate. I refill with a 12 liter CF bottle that I charge with my Bauer compressor every 10 days or so. I shoot at least 1 magazine (17 rounds) every day. I charge the 12 liter bottle to 300 bar. Each time I shoot a mag with the GK1 adjusted to 720 fps, it takes 5 seconds to recharge the gun back to the 300 bar bottle pressure. After about 10 days, the bottle pressure will be typically 290 bar. The Bauer will then recharge the 12 liter bottle back to 300 bar in about 10 minutes.
 
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If you had read all my statements you would know the answer to your question. For your sake, I will restate. I refill with a 12 liter CF bottle that I charge with my Bauer compressor every 10 days or so. I shoot at least 1 magazine (17 rounds) every day. I charge the 12 liter bottle to 300 bar. Each time I shoot a mag with the GK1 adjusted to 720 fps, it takes 5 seconds to recharge the gun back to the 300 bar bottle pressure. After about 10 days, the bottle pressure will be typically 290 bar. The Bauer will then recharge the 12 liter bottle back to 300 bar in about 10 minutes.
Yep. You did answer that. Sorry I missed it and I appreciate the response. Following a couple threads on this gun and it's a bit difficult to keep up with it all.
 
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So since these have to be filled so high does that eliminate the practical use of filling with a portable tank?
Any of you using tanks to fill your gk1? If so what size tank and how many fills are you getting?
Like others have said, the answer is no. I have a portable tank filled to 4500 PSI and when I bring it to the range and shoot for the entire day 8 am to 4 pm shooting about 1500 rounds my portable tank will drop to 3000 PSI at the end of the day when the range is kicking us out. I have my .25 GK1 set at about 800 FPS for the 28.39 gr JSB's and when I shoot the JSB 33.95 gr, I just adjust the dial about 1/2 turn and get the same 800 FPS. The GK1 is a blast to shoot, so reliable, accurate, and hands down it shocks regular firearm pistols as they struggle to shoot and only a few can hit the bullseye consistently and none at 25 yards. While they take their time shooting typically 100-200 rounds before they cannot afford to shoot anymore, I am taking my shots on bullseye every 3-5 seconds as that is what my typical range will limit my speed shooting to. I end up using only one paper target and plastering layer upon layer of bullseye stickers on each break as there is no more paper in the bullseye; the others never need to put new stickers as they never shoot enough in the bullseye to matter :) The attached picture is at the end of the day shooting 1500 rounds with the first 50 or so when I sighted in my new green dot; after that the shots never were outside of the stickers!

50 yards GK1.jpg
 
Like others have said, the answer is no. I have a portable tank filled to 4500 PSI and when I bring it to the range and shoot for the entire day 8 am to 4 pm shooting about 1500 rounds my portable tank will drop to 3000 PSI at the end of the day when the range is kicking us out. I have my .25 GK1 set at about 800 FPS for the 28.39 gr JSB's and when I shoot the JSB 33.95 gr, I just adjust the dial about 1/2 turn and get the same 800 FPS. The GK1 is a blast to shoot, so reliable, accurate, and hands down it shocks regular firearm pistols as they struggle to shoot and only a few can hit the bullseye consistently and none at 25 yards. While they take their time shooting typically 100-200 rounds before they cannot afford to shoot anymore, I am taking my shots on bullseye every 3-5 seconds as that is what my typical range will limit my speed shooting to. I end up using only one paper target and plastering layer upon layer of bullseye stickers on each break as there is no more paper in the bullseye; the others never need to put new stickers as they never shoot enough in the bullseye to matter :) The attached picture is at the end of the day shooting 1500 rounds with the first 50 or so when I sighted in my new green dot; after that the shots never were outside of the stickers!

View attachment 523291
Very nice shooting primaz!
I'm a plinker. So I have my GK1 .22 adjusted to shoot the JTS 16gr pellets. I get four mags, (76 shots) at an average of 710fps. From 300-130ish bar.
These Huben guns, including my K1, appear to be very efficient with air. More so than with any of my other PCP's.
Great shooting machines!!
Have fun
 
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