Air Arms 410SL / 510 Regulator Installation
Got an Audrius Reg from CygnusX that he had imported via mule (mother in law).
Work is very nice
I’ve never had this rifle apart, have messed with the stock and other stuff but the gun has been in one piece since I got it in 2007 so all this was new to me.
After dry firing to empty the tank I loosened the two set screw’s on the barrel band.
That allows it to slide right off
This uncover’s two pin wrench hole’s in the fill valve assembly. I expected the fill end to unscrew but the entire tube unscrewed which ended up being a good thing.
Because it exposed this little peice I wasnt expecting.
Brass tube with a small hole in the end that I hadnt seen in any of the other 410 installation pic’s – appear’s to be a basic attempt at regulation but get’s in the way of the real reg I want to install.
Checked the T.W CHamber’s site (http://www.gunspares.co.uk/ great resource for Schematics and spares) and discovered that it is called the “firing pot” (PW175). It’s on the AA510 page as that is what the 410 Side Lever is called in the UK.
Removed the gauge and loosened a small set screw which retained the pot in place.
I had hoped just to remove it, but it holds the valve return spring…..
The spring is retained by only a small portion of the “pot”, the extra is just an empty space so I chucked it in the lathe and parted the excess of.
This shows after parting and you can see the part that the spring is held up agaisnt
I faced off down to that shelf t get a much shorter pot.
That gave enough room for the regulators included spacer.
This is a string I shot before installation. 2900 PSI, JSB Exact’s
Shot fps ft/lbs
1 915 29.57
2 920 29.89
3 926 30.28
4 938 31.07
5 934 30.81
6 943 31.40
7 939 31.14
8 943 31.40
9 937 31.01
10 936 30.94
11 940 31.20
12 934 30.81
13 929 30.48
14 928 30.41
15 928 30.41
16 926 30.28
17 923 30.09
18 918 29.76
19 914 29.50
20 909 29.18
21 910 29.24
22 907 29.05
23 902 28.73
24 896 28.35
25 894 28.22
26 890 27.97
27 888 27.85
28 883 27.53
29 879 27.29
30 875 27.04
Unfortunatly the gauge o-ring had not been placed in the recess when it was installed so it was crushed and I couldn’t re-use it. Took my air compressor’s auto drain apart to find an o-ring that would work – but its still got an audible leak until the Hardware store opens.
This is string with regulator installed with a leak so I’d expect more shot’s. Same fill and pellet.
Shot fps ft/lbs
1 882 27.47
2 887 27.78
3 884 27.60
4 885 27.66
5 891 28.04
6 890 27.97
7 888 27.85
8 892 28.10
9 889 27.91
10 890 27.97
11 889 27.91
12 892 28.10
13 892 28.10
14 891 28.04
15 886 27.72
16 891 28.04
17 892 28.10
18 892 28.10
19 890 27.97
20 891 28.04
21 892 28.10
22 889 27.91
23 890 27.97
24 887 27.78
25 877 27.16
26 865 26.42
27 860 26.12
28 852 25.63
29 845 25.22
30 841 24.98
Seems to drop off the regulator around shot 25.
Chart of both results, unregged in Red, regged in Green.
Once I get a replacement gauge block o-ring I’ll do a new string which I expect to be a bit longer.
I’m happy with the string so will likely drill the vent hole in the air reservoir at some point (and possibly duracoat the tube as I’m sick of wiping it down after shooting).
All Replies
tingle when you do it…. 3,600psi would send my jewels to the esophagus.
Maybe we can get Walter to chime in… He has a ton of experience with tube
guns..
W A L T E R ?
If you have ever considered using the inexpensive CO2 cylinders for HPA, but hesitated to because it is neck stamped “1800 psi”, kindly note the little bronze burst disk on the neck of these bottles, at least on the ones I checked, were stamped “3K”, or 3,000 psi. That’s the pressure at which that little disk will burst and vent air, thus keeping the “1800 psi” bottle from exploding. Hmmmmmmmm? Contradiction anyone?
Just about every high pressure container has a safety valve somewhere in the system. Find out what the relief pressure is on your rifle, then consider how to safely proceed. Granted the valve and such may not operate above factory recommended fill levels, then again perhaps they will. As Harry Callahan once said: “How about it punk? Are you feeling LUCKY?”
Naturally I actively discourage everyone from taking foolish chances with their lives and safety by filling any HPA device above factory recommended levels.
WHOOPs….MAM is right. No relief valves on tube guns. Disregard above!
Yours in ignorance…
Kindly ‘Ol Uncle Hoot 😯
I can speak for the two I have on their reliability.
I have one in an AAS400MPR FT and it’s still consistently giving me around 115 shots at 13fpe… very consistent.
The other is in an S400C and while the velocity wasnt what I had hoped for, it continues to perform just fine. When I finally run the air out, I’ll look into giving it more volume such as YN did.
I’d also be interested in the ansmer to the last question…IS everything still good with the regulator, or have problems come up..I have an S410 Carbine, and plan on changing to a Classic air tube and install regulator at same time…..so let’s hear how they’re working after having had some use…TIA 😀
It’s been 3 months or so since you guys installed the regulators.. How are things now? Are the numbers holding up, or are they fluctuating? Did you drill the relief hole in your air tube? Any problems with the drilling? If you wanted to go back to stock setup, how would you patch the relief hole?
Thanks, Terry
This discussion ?
I personally have no intetions of filling past 210BAR but when someone over at a US forum mentioned 220+ BAR I thought I ask the pro’s over hear at the AA forum…
Funny thing… he replied to my concern on his comment that he “read” it on a Danish forum but never said whether he’s filled to that pressure himself…. Phssst…. armchair “airgunsmith”
Over filling is nothing compared to drilling a hole in a pressure vessel…..
Was it a S410 Xtra FAC and on a regular basis or was it just “lets give it a try” for a few time but back to 200 – 210 BAR?
Just curious….
Haven’t done an Air Arms…. The most I fill to now is 3,200psi. In my mind
the danger factor starts to out weight the increased shot count increase. But
only because I am not sure how much the tube can hold and I don’t know
how much PSI the regulator can handle…
Was it a S410 Xtra FAC and on a regular basis or was it just “lets give it a try” for a few time but back to 200 – 210 BAR?
Just curious….
I know this is off topic but it was brought up… I’m having the same discussion over at the AA forum becuase it was mentioned here and yes the FAC tube have been tested to 300 BAR at the factory but the SWP of the cylinder says 200. I’ve read that there are air cylinder that have the SWP rating of 300BAR but the S410 is only 200.
BUT does that mean we can just go ahead and fill to that pressure all the time???? Yah… the Audrius video shows him filling to 260 BAR but that’s his custom made PCP.
The guys in the UK are filling their BTAS, Audrius and Tweeky reg’ed S410 to 210 bar which gives them a extra 10 or so shot. Filling to 220 – 250 BAR is not nessassary and yes can cause damage/ bulging to the cylinder in the long run. Explosion…. no ones ever heard of an incident yet.
I’m for 210 BAR fill but 220 – 250 BAR on a regular basis….. up to that owner I guess.
I have pushed my tube guns to 3,400psi but it sure makes your nut sack
tingle when you do it…. 3,600psi would send my jewels to the esophagus.
Maybe we can get Walter to chime in… He has a ton of experience with tube
guns..
W A L T E R ?
i dont know…but thats what they do on the danish forum !
No disrespect but 210 BAR I’ve read BUT 220 – 250 BAR on a S410 cylinder???
dont forget with the reg installed you can fill to 220-250 bar
Very nice YN…. Have you cut the Hammer Spring yet? Warning… take alittle at a time. I removed about a coil and a 1/4.
With the HS at full length and pretention you are wasting air. But it depends on what you want 20 – 30 shots at full power and consistant or 40 + shots at a slightly reduced power and consistant.
Did you read my posts here: http://talonairgun.com/forum/viewtopic.php?t=14756 and here
http://www.airarmsownersclub.com/viewtopic.php?f=3&t=25980
This is what I have now:
Start fill was 2900psi and finished at about 1700psi. Regulator set at about 140 – 145 BAR. AA field 16 gr. Pellets.
891
898
897
898
892
880
901
898
897
896
AV 895
ES 20.88
SD 6.08
897
898
897
896
893
896
896
895
897
895
AV 896
ES 5.76
SD 1.73
895
899
897
895
896
894
899
895
898
897
AV 896
ES 5.58
SD 1.73
895
897
898
898
895
898
896
897
897
892
AV 896
ES 6.23
SD 1.73
891 – This is where the FPS drops… at shot 41
886
884
883
876
I could of had this but lost it 🙁 when I took the spring too far, I do have 4 extra on the way for further testing:
Start fill was 2900 psi – end fill was about 1450 psi after 80 shots. 14.3 gr CP-HP unsorted and I did not right it down but think I had the reg set at around 125-130BAR:
826
838
844
845
842
850
856
857
858
880
AV 848
ES 33.28
SD 10.67
837
855
854
851
857
845
851
854
850
849
AV 850
ES 20.19
SD 5.83
853
858
851
856
858
853
860
859
855
853
AV 856
ES 8.59
SD 2.82
841
846
845
846
844
857
847
852
850
855
AV 848
ES 15.89
SD 4.79
842
850
852
842
854
851
859
859
855
850
AV 851
ES 16.91
SD 5.65
839
833
848
848
852
849
852
848
853
852
AV 847
ES 20.32
SD 6.55
849
860
856
868
869
868
857
863
859
855
AV 860
ES 19.26
SD 6.55
851
857
855
856
853
847 – FPS drops here.
848
845
841
834
AV 849
ES 22.80
SD 7.28
so the 2 holes on each side of the return spring vent directly into the spring
from the side so the air doesnt have to go through the “pot” which is just a spring retainer now
this is done as when the pressure gets low it looses speed, but this is acounted for letting the air bypass the pot and come in directly from the sides….as far as i understand from the danish forum
in short it is not just to increase volume, but get the air to flow in from the sides
heres a picture that shows how deep its done
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Hoot as far as I know and from what I have read and seen on mine, I don’t
think tube guns have a burst disc…..?????