The Makita guide rail with item number 199141-8 is not specifically designed for the Makita 5604 R circular saw. Here are some important points regarding compatibility:

- The 199141-8 guide rail is mainly compatible with models such as the SP6000, DSP600, and other specific circular hand saws and plunge saws from Makita.
- There is no explicit mention of compatibility with the Makita 5604 R circular saw in the sources provided.

To ensure that the guide rail is compatible with your saw, I recommend checking the specific adaptations and adapters required for your saw or contacting Makita customer service directly.