The shiny slide seems to stand up better to scratches though. My 2011 matte Gen 4 is more scratched than my glossy 2004 Gen 3. I understand Glock's going back to the glossy finish because of complaints.
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