Yeah it looks like you're GTG ...
•-The M16 carriers are Chrome lined with a Mil-Spec phosphate finish.
•-The Full Auto M16 bolt is shot peened, HP Tested, & MP Inspected
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek