Hi Darius and welcome. No, a standard G20 barrel is not compatible with a G30 frame without significant modifications. Cheers and stay safe!

Good morning to you!! Sorry but no. The G20 is not compatible with a G30. Hope this helps. Have a good rest of your day.

No...
Here's a more detailed comparison:
Glock 20:
Chambering: 10mm Auto
Barrel Length: Longer than the Glock 30
Purpose: Typically used for hunting, competition, or as a backup weapon for situations requiring more power.
Size: Larger than the Glock 30
Available Models: Glock 20 SF (Short Frame) for shooters with smaller hands.
Glock 30:
Chambering: .45 ACP
Barrel Length: Shorter than the Glock 20
Purpose: Often chosen for concealed carry due to its smaller size and more manageable recoil.
Size: More compact and easier to conceal than the Glock 20.
Magazine Capacity: Limited to 10+1 rounds in many areas.