Description
This is for the installation of your new USGI FSB on your new or unused barrel.
WE DO NOT install FSBs on a pre drilled barrels.
We do not install FSBs on .308/7.62 barrels.
Do NOT send an assembled upper without ordering the disassemble – reassemble services.
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.”
