What are the differences between a 21-degree framing nailer and a 30-degree framing nailer?

The main difference between a 21-degree framing nailer and a 30-degree framing nailer is the angle at which the nails are loaded and fired. A 21-degree framing nailer uses nails loaded at a 21-degree angle, while a 30-degree framing nailer uses nails loaded at a 30-degree angle. This difference can affect the accessibility and maneuverability of the nailer in tight spaces.