It is right handed and as for the springs, I could not advise. I know I installed it in my 308 and I was very impressed. Very light first stage and the second stage was also light and unbelievably crisp. I never shot the rifle, and I removed the trigger. To good of a trigger for the price the rifle sold for. So know I have a trigger that I won't be using.
Thanks for the reply back, hope that helps.