They are fully adjustable. Without really disagreeing with Mike B's post, I would highly recommend that you adjust the trigger the right way, not merely 2/3 of the way. I've adjusted both my PSS and my VSSF with the method outlined, IN DETAIL, by Pablito in the "ARTICLE" section of
http://www.snipercountry.com
under the heading "How To". It works like a charm and I've never had an adjusted trigger fail on me yet. Follow the instructions to the letter and you'll be on your way.
Absolutely no offense intended to Mike B's post, but if you adjust the trigger, adjust it fully, in sequence, and there is much less of a chance of having a problem in the future.
Cheers,
Mike
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"There's gunpowder and there's pu**y. Live by one, die by the other, and love the smell of both."