From all I can find out about them, the answer is no, they are not adjustable. Ruger is notorious for having particularly bad "lawyer triggers." The LC-6 is not that much of an improvement over the old MK-II trigger. The only Ruger rifle with an adjustable trigger is the Varmint/Target version, and while adjustable it still leaves a lot to be desired, especially for a dedicated varmint/benchrest rig. I had an M77 MkII V/T in 22-250, and I did adjust the trigger, but the best I could do with it was what I consider barely adequate for a big game hunting rifle. It was still creepy and somewhat heavy. There are aftermarket adjustable triggers made for the M77MkII's and Hawkeyes. You can find them by googling "ruger hawkeye replacement trigger".

Mike