Grip plug with built in Glock tool kit. Super cheap and effective upgrade:
https://alnk.to/5uf0tQi

The Gucci-est of Glock accessories. USA MADE. Not inexpensive but extremely high quality:
Tyrant CNC
https://alnk.to/8EIE8rh

10% off everything with code: DGRSFARM
https://rockyourglock.com/?ref=ki6khmn9

*Links above are channel affiliate links.