Something that I've found that helps is to remove the scope entirely and attempt to aim using the rail - you'll quickly find if it's the rail or the actual weapon that's mis-aligned.
Also Chief has a good point - when I first got my L96, it had a 3inch bias from 30ft to the right as well... When I took it all apart, my hop-up was the culprit.
Good luck with fixing, and hopefully you'll get it soon!
Maybe pics might help? (Meaning you can discover alignment issues with pics where eyeballing might not work... and we could potentially take a look too?)
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