Regulated a Air Arm...
 

Regulated a Air Arms S400 tonight  

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pluric
(@pluric)
Joined: 2 years ago
Posts: 478
2018-02-20 21:58:39  

I'd bought this customized S400 from Charlie Frear of Georgia Airguns. what  a great guy to do business with! I'd noticed a regulator for it in Yellow classifieds and thought I would try it out. I originally planned to do before and after testing but after looking at the Altaros web site I wasn't sure if what I'd bought was for this gun. Couldn't stand not knowing  and tore the gun down to make sure.

aa

I looked into the air tube and could see a cone shaped something a little over halfway up the tube. The web parts diagram did not show anything like it. So I tried to take the fill top off to investigate. No way. that thing is on there. Did manage to break the barrel band while using it to keep the tube from spinning. Arrrgh. 😬 New one out of England on the way. I gave up and left whatever that is in the air tube,

3003b

It's an odd looking regulator. Long and skinny. You can see the stock brass short piece that is replaced by the longer regulator.

3003

Chrony results.

3003c

Too much snow outside to try it at any distance so I was using the basement 10 meter range rested on a not to stable Caldwell tripod.

3003d

For being on a wiggly rest, broken barrel band and using out of the tin JSB 8.44 pellets it did okay. 😀 

3003a

 


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Limbshaker
(@limbshaker)
Joined: 2 years ago
Posts: 53
2018-02-21 12:26:20  

Those guns have a LOT of hammer energy, too much really IMO. 

 

If you keep tinkering lighten the hammer and/or clip the hammer spring and the efficiency will go way up. 

 

I had a .22 carbine and it was an awesome gun after that! Cool looking rig man, have fun with it. 

Speed doesn't mean a thing without precision.


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pluric
(@pluric)
Joined: 2 years ago
Posts: 478
2018-02-21 12:38:36  

Good advice. My other .177s shoot lower speeds and I'm just starting to play with this one. Not really sure where its "sweet spot" is. I ran out of time while doing the initial testing. Damn daughter in law decides to have her first baby last night. 😜  Once I get back off cloud nine I'll mess with it some more. Looks to have a hammer spring adjustment screw in the rear. Really know very little about the gun other than it has been an accurate shooter. Seemed to be a little fill pressure sensitive so I thought regulated it would be a touch more consistent. 

 


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TerryVanpool
(@tvanpool)
Joined: 2 years ago
Posts: 67
2018-02-21 14:02:21  
Posted by: pluric

 Looks to have a hammer spring adjustment screw in the rear. Really know very little about the gun other than it has been an accurate shooter. Seemed to be a little fill pressure sensitive so I thought regulated it would be a touch more consistent. 

 

There is "no" hammer spring adjustment on these guns. The screw you are looking at only holds the trigger group to the valve body. The only ways to adjust hammer strike is to modify/replace the spring or modify/replace the hammer. I have had the best luck by making my own hammer and making it longer and lighter. Longer to reduce the hammer throw and lighter to reduce the strike force. When balanced well you should get 100+ shots at 18 to 19 ft.lbs. from a 3k fill.

The cone shaped object you see in the air tube is the factory de-pinger. I usually remove it but it does not hurt anything by leaving it except for the small (insignificant) space it occupies.  

Charter Member of "The Over the Hill Gang"


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