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Benjamin 397 Tuners?

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(@njnoodles)
New Jersey
Joined: 7 years ago
Posts: 79
Topic starter  

My daughter bought me a Benjamin 397 177 Cal, would like to have it tuned to make it a smooth shooter, I ordered the Super Sear,and Williams rear peep.  Inside the Bday card my daughter wrote "Your Daystates are too Easy, Try This"


   
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(@johnny366)
Arkansas
Joined: 7 years ago
Posts: 430
 

Just make sure to remove the paint over spray in the muzzle. I have one that didn't group well with any pellet. I saw on the old forum about the paint over spray in the muzzle. I cleaned it thoroughly with a q-tip and lacquer thinner and it shoots JSB pellets now in the same hole at 25 yards off the bench sand bagged. The super sear is a great way to make that trigger better. I also tried the peep sight but went back to the regular sights because I couldn't get the peep sight to adjust low enough. If you scope it, try using a "scout" type mount so it is easier to pump the way it was intended. This is the way I do all my old Benjis and Sheridans. Just shoot it as is and it will smooth out.  I have several Daystates and one RAW, but I still like the old pumpers and shoot them regularly.


   
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(@njnoodles)
New Jersey
Joined: 7 years ago
Posts: 79
Topic starter  

Thanks for the Info about the Over spray, This gun does bring back memories, and It is very enjoyable, I love all the different types of airgun power plants, By the way, My arms and shoulders are killing me, I actually like the fact with 2 pumps it' shoots at 525 FPS with JSB 7.9s.


   
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Domer_Pyle
(@domer_pyle)
Wisconsin
Joined: 7 years ago
Posts: 67
 

They're easy to take apart. Look up the double spring mod for the valve, and leave about a 0.05" gap between the valve halves when you put it back together. You'll need a lot of teflon tape and possibly a thicker o-ring to keep it from leaking but it reduces the space between pump cup and valve nose when the arm is closed. Between those two mods alone my 392 shoots Premiers at 710 fps and my 397 shoots Premiers at 805, both at 8 pumps. Hopefully you got an accurate one, I've given up and designated both of mine as wall hangers


   
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(@rob112o)
Joined: 7 years ago
Posts: 6
 

When you have the trigger assembly open. Cut/grind that top part of the trigger that stick out of the assembly. This will allow you to decock the rifle. 

Yes, the 2 spring mod makes pumping a bit easier on the earlier pumps. Also makes those pumps more efficient. Also, insures a full dump if and when you pump to 8.

Doing the 2 spring mod may require you to cock rifle for it to take a pump. That's where the first mod comes in handy. 


   
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(@njnoodles)
New Jersey
Joined: 7 years ago
Posts: 79
Topic starter  

Thanks for the Info, I think I' just going to keep it simple with Just the Super Sear Install and Williams Peep, It' actually very accurate out of the box, just have to check for the over spray in the Muzzle, I have it apart already, I'm going to Hone all the rust out of the Pumping Tube.


   
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(@rob112o)
Joined: 7 years ago
Posts: 6
 

Hmmm, you shouldn't have rust in the tube. Especially, since the tube is made of brass. So are you confusing the color of the brass as rust? The thing that can be rusty in your tube would be the steel piston. So if it's rusted up good. You should box it back up and get a new one(if it was bought new)

   Upon, doing the cleaning of overspray in muzzle. Place a towel or something under the buttstock. This will keep the rifle angled down so no cleaning solution makes it into the valve as your trying to remove the over spray.   


   
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(@johnny366)
Arkansas
Joined: 7 years ago
Posts: 430
 

Rob is right, brass or bronze does not rust. 


   
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(@njnoodles)
New Jersey
Joined: 7 years ago
Posts: 79
Topic starter  

Looking into further definitely Brass with Black Overspray.


   
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Steve_in_NC
(@steve_in_nc)
North Carolina
Dealer
Joined: 7 years ago
Posts: 732
 
Posted by: Rob112o

When you have the trigger assembly open. Cut/grind that top part of the trigger that stick out of the assembly. This will allow you to decock the rifle. handy. 

An even easier way to remove the top tab on the trigger is to simply grab it with pliers and snap it off.  The material (sintered metal?) is very brittle.


   
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(@njnoodles)
New Jersey
Joined: 7 years ago
Posts: 79
Topic starter  

Thanks for the info, Definitely easy to work on, reminds me of my RWS 850 tuning days many, many years ago.


   
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