I have 2 lowers that are sequential serial #'s. finally got around to assembling my parts and discovered something really odd. the rear takedown holes are roughly 0.002" too high. when I try to insert the rear pin it binds.
1: send them back. takes time and will require all the paperwork BS when the replacements arrive.
2: open the top of the holes to let the pin pass thru. not sure if this is wise.
anyone have a suggestion?