Glock 19 Gen. 4 ZEV RMR upper slide with channel liner installed. Slide was purchased new and it only has 45 rds through it with zero issues.
ZEV Spartan RMR Slide with no internals
ZEV Combat sight set
ZEV Alum. back plate
$475 shipped to US lower 48.
Price is FIRM
Only trades I would be interested in is for a Glock 17 Gen. 4 or Glock 26 Gen 4 with no mods that is in very good conditon.