Question about BSA Big Cat 3.5-10X 42mm (3.5-10x42 mm)

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Nitrogen gas refilling in a rifle scope.

How is nitrogen gas filled into a newly openned and cleaned frifle scope?

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At a factory, the scopes are emptied in a vacuum chamber and nitrogen gas is used when the chamber is allowed to repressurize to the surrounding environment.

One possible solution is to re-assemble the scope in a clear plastic bag filled with nitrogen gas (working through the bag to re-assemble). Large plastic gloves can be taped into the sides of the bag.

Posted on Oct 15, 2008

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Posted on Jan 02, 2017

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1 Answer

Diana scope 3-9x 40 AO - I need a parts diagram and how to find spare parts to it. In a 'just in case mode' (Magnum airgun recoil) what spare parts should I have to this scope?


Hi Marcos
You will probably not find any spare parts for the scope, unless you will write or contact the manufacturer of the scope.
I do not recommend that you repair the scope yourself, as it has to be reinstalled properly and also most are nitrogen filled to stop fogging of the lenses.
Make sure you only use a scope that is designed for an air rifle, because the spring pushes and pulls the gun when it fires and it has to have the "air rifle" scope to handle the double recoil if not you will break the reticles of the regular gun scope.
Bud

Oct 18, 2013 | Garden

1 Answer

How to clean


Only wipe down the exterior and blow off the lens with low pressure air then use a very good lens solution to clean them
Do not strip the scope unless you have access to nitrogen purging equipment

Sep 18, 2013 | Bushnell BANNER RIFLE SCOPEPower: 3-9X40 /...

1 Answer

How to disassemble my bushnell sportsman rifle scopes coz i wnt to clean it


On my Bushnell scope I have an adjustable angle ring that will bring in the view, it is held in place with 1 screw. remove it and pull down towards the windage and elevation adjustment screws. There are 3 tiny phillips screws, remove them. Then unscrew the end of the Eye Peice end peice with the lens in it. inside on the outer edge of the main tube there is a locking ring that keeps the eye peice from unscrewing off, remove it and unscrew the entire eye peice. you are now ready remove the inner tube. Be careful here this is where you can damage the cross hairs and lose the leaf spring that maintains pressure against the windage and elevation screws. When you reassemble after cleaning and with the elevation screw at 12 o'clock and windage screw at 3 o;colck, the leaf spring will be in the 7 or 8 O"clock position, it just sits in there up against a little ridge inside, with the bow facing to the center. Back off the elevation and windage screws all the way so they don't block the inner tube from going in all the way. Once it is in adjust it so the cross hairs are orented correctly and put it back together. If you want to refill with Nitrogen remove the front lense and take to someone that fills tires with Nitrogen and inject the nitrogen into the scope, Quickly reinstall the front lens as nitrogen is about 3% lighter than air and if you take too long it will all escape.
This worked well for me. Good Luck and Happy shooting

Apr 27, 2011 | Bushnell Sportsman 4x32 Riflescope (4x32...

1 Answer

Scope is a 1995 year model. Optics got blurry this season.


could be the the eye sight adjustment piece at the front of the scope got turned some how , try turning the lens piece to focus ... If it looks like fog , it is probably the nitrogen has leaked out, you will have to return it for repair..

Dec 30, 2010 | Tasco World Class Rifle Scope 3-9x50 Matte

1 Answer

I have a Bausch & Lomb Trophy Riflescope Balvar Years ago it fogged up while hunting on a cold wet day. I sent the scope in for repairs and got it back, put it back on the rifle and about the third...


most things can be fixed again however at what cost???
the scope should be striped down and cleaned new "O" rings fitted to keep out the damp and then re-gased,,,,pricy job?
you could undo the small screw on the scope body and try warming the scope up to force out the damp air inside it then get some "NITROGEN gas" not co2! and blow that into the screw hole to push out any damp air left in it out and to re-gas the scope,,,,it may work it may not,,,,the nitrogen gas can be found at a camera shop check on the gas first but i think its called "dust away or dust off!" for blowing out camera bodys
dont start a gale inside your scope just jentely blow in the gas

Aug 30, 2010 | Bausch and Lomb Bausch & Lomb Hunting...

1 Answer

My scope on my rifle is foggy on the inside


You can try to clear this your self. You will need a good sized clear plastic bag, say kitchen trash can size. You will need to get your hands on some nitrogen gas or you can also use carbon dioxide gas. You will need some good electrical contact grease or Vaseline will also work. Take the focus lens off your scope, let it dry out a day or so. Now ck for any o-rings and try to find new if you can, put the grease on the screw threads. Put all the scope parts in the bag and pump up the bag with your nitrogen and tie off the bag but leave room so you can screw the lens back on once it has set for a little bit in the gas. This should let gas stay inside the scope so no moisture can get back inside to fog it up. Try that, sounds crazy but it will work. 

Dec 09, 2009 | Optics

1 Answer

Rifle scope fogging


You can try to clear this your self. You will need a good sized clear plastic bag, say kitchen trashed can size. You will need to get your hands on some nitrogen or you can also use carbon dioxide. You will need some good electrical contact grease or Vaseline will also work. Take the focus lens off your scope, let it dry out. Now ck for any o-rings and try to find new if you can, put the grease on the screw threads.Put all the scope parts in the bag and pump up the bag with your nitrogen and tie off the bag but leave room so you can screw the lens back on once it has set for a little bit in the gas. This should let gas stay inside the scope so no moisture can get back inside to fog it up. Try that, sounds crazy but it will work.

Dec 03, 2009 | Optics

1 Answer

How do I disassemble a bushnell scope?


You don't if you want it to work right again as they are filled with nitrogen gas to keep them from fogging.

Jul 20, 2008 | Bushnell Sportsman 4x32 Riflescope (4x32...

1 Answer

Lens Fogging Issue


Apparently this is NOT a waterproof rifle scope. I would return it as you will have this same problem only worse out in the field. Buy a waterproof nitrogen filled rifle scope.

Dec 06, 2007 | Bushnell NorthStar 78-8890 (300 x 90mm)...

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