Description
This is for the installation of a new, ADCO supplied F Height USGI FSB on a new undrilled barrel.
FSBs will be installed to Mil spec Mil-C-70599A section 3.4.6
“The normal rear sight peep (sight rotated fully rearward) shall be used with the rear sight set centrally in the slot for windage within plus or minus five (5) clicks.”
