I see a lot of "tactical style" bolt handles in pix on this site, and I see SSS has one I like. How difficult is it to take my factory bolt off and put a new one on? Also, I need a LA Centerfeed floorplate(either DBM or Hinged, I don't care)Trigger guard, and action screws. I also will need a Magnum mag box and I would like to buy a factory bolt with Mag bolt face. All for putting on a 112 action 25-06/7mm Mag build. Where is the best place to order these? Thanks!