Parts diagram for Gamo Whisper air rifle - Sport & Outdoor - Others

Ok, set your air rifle in a Vise.
Take a target, look down the barrel of the air rifle and move the target until it is centered on the hole in the barrel.
Adjust the sight until it is centered on the target.
After that the only thing that you need to do is adjust for the range (distance/elevation/vertical setting) of the target.

Regards
Geoff

Red Laser Sight 650nm Weaver rail mount - Gamo USA

www.gamousa.com > Optics > Airgun Lasers and Lights

650nm Red Laser Sight with Weaver style rail mount.

Gamo airgun accessories, spare parts and products ' Gamo ...

www.gamousa.com/category.aspx?catID=4

Air Rifle Scope Mounts/Rails. Air Rifle Scope Mounts/Rails. Air Rifle Sights. Replaceable sights for air rifles. Air Rifle Spare Parts. Replaceable parts for air rifles.

Gamo Big Cat 1250 Problems - Airguns & Guns Forum

www.gatewaytoairguns.org > ... > Gamo & Spanish AirGun Gate

Feb 24, 2013 - 20 posts - ‎8 authors
Gamo Big Cat 1250 Problems, Air guns, Airgun Forum. ... OK, so I bought my first air rifle since being a kid with a crosman 760 and it was a .... but when you get into the 800 and 900 fps range they tend to lose accuracy fast.

gamo lost power Questions & Answers - Fixya

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Get free help, tips & support from top experts on gamo lost power related issues. ...My gamo whisper classic with the nitro piston is recoiling hard and is ... IM LOOKING FOR A REPLACEMENT MAINSPRING FOR GAMO BIG CAT 1250.

Big Cat® 1200 Air Rifle ' Gamo USA

http://www.airrifleshop.co.uk/Airgun%20manuals.htm
Has some gamo manuals not the specific one you want but has all the important info for safety and operation plus zeroing if its a parts diagram you want look at the following link
http://www.aceros-de-hispania.com/MANUALES-DESPIECES/DESPIECES-CARABINAS-GAMO/despiece-silent-stalker.jpg

Depending on which parts you require you should contact this site.
Air Rifle Spare Parts

no its not normal,,,check that the piston crown is not braking up as if it was the piston would smack into the breach block causing the hard thump on firing

I'm not familiar with the scope, is it an air rifle scope? One stroke type? If not, the backwards recoil of the air rifle is tough on a normal scope, they aren't made for that type of abuse. They work fine with a normal recoil. That is why they started making air rifle scopes. I'm sure that the internals of your scope are damaged somewhat, you can take off the eyepiece no problem, you might find something in there, loose screw, missing screw, you never know, don't get too carried away with the dis-assembly, you'll never get it back together. It sounds like the magnification ring is messing with the focus of the eyepiece. Might just need some oil. Hope this helps.