GTA
All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Topic started by: kriss on December 26, 2015, 02:21:42 PM
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hi everyone and merry Christmas to you all. took my new at44 long out today in 25cal and had small problem. I filled cylinder up to 200bar but my first 10 shots really didn't open the valve when firing so would like to ask anyone who owns one of these guns how many turns out is your hammer adjustment set at please ? many thanks in advance.
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That adjustment to is not exact. What my gun needs may be completely different then yours. Still there is some good ideas on where to start. Your other option is to lower your fill level. If it starts shooting at 190 bar fill it 190 instead of 200.
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That adjustment to is not exact. What my gun needs may be completely different then yours. Still there is some good ideas on where to start. Your other option is to lower your fill level. If it starts shooting at 190 bar fill it 190 instead of 200.
many thanks zandrew next time out ill try that also a 190 fill should cure the problem .
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Held off on this as I’m embarrassed to say that I’ve lost the information on what size Allen key is used.
My record keeping hasn’t been the best of late.
Anyway, the striker spring adjusts backwards to what you might first expect. It adjusts from the front of the spring, so turning it counter clockwise actually increases the spring tension.
Also means the Allen key has to be a long one….which I didn’t have. Did have a spare short one, which I cut and silver soldered to a length of brass rod. That explains the odd looking all key in the pictures.
At the rear, under the safety, will find a hole like this. The Allen key goes in, through the center of the spring, and finds its mate deep down…so it needs to be a long Allen key.
(http://i157.photobucket.com/albums/t50/ribbonstone/pneuma/DSCF1199.jpg) (http://s157.photobucket.com/user/ribbonstone/media/pneuma/DSCF1199.jpg.html)
Will find a little hole in the air tube. As you turn the adjustment, are likely to also turn the striker (which is pretty much round in a round hole). There is a cross hole in the striker, and you can see it through the hole in the air tube, so can run any small sized metal rod (in this case an Allen key) into that cross hole to stop the rotation.
(http://i157.photobucket.com/albums/t50/ribbonstone/pneuma/DSCF1196.jpg) (http://s157.photobucket.com/user/ribbonstone/media/pneuma/DSCF1196.jpg.html)
Basically, like this:
(http://i157.photobucket.com/albums/t50/ribbonstone/pneuma/DSCF1201.jpg) (http://s157.photobucket.com/user/ribbonstone/media/pneuma/DSCF1201.jpg.html)
(http://i157.photobucket.com/albums/t50/ribbonstone/pneuma/DSCF1192.jpg) (http://s157.photobucket.com/user/ribbonstone/media/pneuma/DSCF1192.jpg.html)
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hi ribbonstone, now im the one who,s a little embarrassed now as I know how to adjust the power and I have the long allen key I was after some kind of setting you folks in the states run at i.e how many turns out is your adjuster inside the hammer? (please) I think next time out aswell im filling to 190 bar. if you could give me some idea on how many turns out yours is and what ft/lbs its chucking out at said turns. many thanks in advance
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All I can tell you is that it took a good bit of work, and I've lost how many turns in or out from "issue" it took.
Basically filled the cylinder to my projected top pressure (in my case, 2900psi).
Shot the rifle over a chronograph looking for a slight rise in velocity in the first shots. Keep shooting until it rises, peaks, and starts to fall off in speed.
Ideal is to have it to rise up to about 4% less than whatever it's peak is, stay very near the peak speed for a number of shots, can cut off the shot count once it falls back down to 4% under peak speed.
(The above sounds easy when I type it...but it's a lot of fiddling around and shooting to get there. If it starts out fast, then you've too much striker tension. If it starts out much slower than 45 under it's peak speed, then you have too little spring tension. Not shooting at all would count as "too slow".)
If the end result (starting about 4% under max, peaking at max, and down to 4% under max) isn't fast enough for you, then time to look into modding the valve stem/improving air flow.
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All I can tell you is that it took a good bit of work, and I've lost how many turns in or out from "issue" it took.
Basically filled the cylinder to my projected top pressure (in my case, 2900psi).
Shot the rifle over a chronograph looking for a slight rise in velocity in the first shots. Keep shooting until it rises, peaks, and starts to fall off in speed.
Ideal is to have it to rise up to about 4% less than whatever it's peak is, stay very near the peak speed for a number of shots, can cut off the shot count once it falls back down to 4% under peak speed.
(The above sounds easy when I type it...but it's a lot of fiddling around and shooting to get there. If it starts out fast, then you've too much striker tension. If it starts out much slower than 45 under it's peak speed, then you have too little spring tension. Not shooting at all would count as "too slow".)
If the end result (starting about 4% under max, peaking at max, and down to 4% under max) isn't fast enough for you, then time to look into modding the valve stem/improving air flow.
Ribby the size of the wrench is 4MM. have a nice new year you are great to have here on the site
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All I can tell you is that it took a good bit of work, and I've lost how many turns in or out from "issue" it took.
Basically filled the cylinder to my projected top pressure (in my case, 2900psi).
Shot the rifle over a chronograph looking for a slight rise in velocity in the first shots. Keep shooting until it rises, peaks, and starts to fall off in speed.
Ideal is to have it to rise up to about 4% less than whatever it's peak is, stay very near the peak speed for a number of shots, can cut off the shot count once it falls back down to 4% under peak speed.
(The above sounds easy when I type it...but it's a lot of fiddling around and shooting to get there. If it starts out fast, then you've too much striker tension. If it starts out much slower than 45 under it's peak speed, then you have too little spring tension. Not shooting at all would count as "too slow".)
If the end result (starting about 4% under max, peaking at max, and down to 4% under max) isn't fast enough for you, then time to look into modding the valve stem/improving air flow.
hi ribbonstone, its all about trial and error then so ill take it out for the day maybe tomorrow. many thanks for all your help and advice its very much appreciated.
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How did I miss this thread? I have one in each caliber and love the way they shoot for $139!!!
Have only modified the grip so far on the .177.
I really don't want more power, just consistent velocity and accuracy!
Also would like to go HPA and a regulator.
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How did I miss this thread? I have one in each caliber and love the way they shoot for $139!!!
Have only modified the grip so far on the .177.
I really don't want more power, just consistent velocity and accuracy!
Also would like to go HPA and a regulator.
Where are you finding them for $139?