Yes, it's compatible, it doesn't seem to need an adapter for this product combination. :)

"The Makita guide rail is ideal for accurately guiding hand-held circular saws. The guide rail can be used with the 5103R, 5903R, HS0600, HS6101J1, HS7101J1, HS7601J and HS7611 handheld circular saws in combination with a guide rail adapter."