What size roll pin holders do I need to install my LPK on my stripped AR15 lower?
A set of holders and punches from Brownels or Midway cost about $25, for both sets. # 1S, 2S, 4S, 5S for spring pin holders. 1/16, 5/64, 1/8, 5/32", for spring pin punches. Brownells has a special punch for install and removal of the bolt catch. Never had to remove one so thats all I know about it. Sears and NAPA have roll pin punches as well. Spring pin on a rifle, roll pin on everything else. Go figure.
Or you could go the build it yourself link and save the $25. They aren't really needed unless you want them.