Over-Under Trigger Adjustment??

[pcgobbler]

I have seen where more and more guys are going with over-under or sxs for turkeys so they can have a tight choke and a more open choke.  I am going to try to put a 20 together before next season, and my question is can the trigger be adjusted on one of these guns?  I have heard they cannot be, is this true or not?  I am a very big fan of having a 2-3 lb. trigger on my turkey guns.  I think this helps to aim as with any good deer rifle.  We as turkey hunters often have to make very precise shots.  Also, are some brands adjustable and some not??

[wis. bowhunter]

Contact bill springfield at www.triggerwork.net and ask him if that gun can be adjusted. He did a good job on my mossberg 835