Is there an adjustment screw for the trigger,I have one in pistol grip 308 and trigger is not the best

The trigger is nonadjustable.. If you don't like it sell it and try a new /used one until you find a trigger you can live with. I have had 2 that have had not so great triggers but still shot fine(go figure). Some gunsmiths can fix a trigger but they are far and few between and I wouldn't bother looking for one.

There is not much you can do for a BLR trigger. There are few gunsmiths that will work on its trigger.
If the gun is new the trigger may improve some with use

jaygird2:

Try this guy: Mountiandog Gunsmithing 575-756-2331. Good luck.