The original MCA information from 2013 had the SLO GPA capped at 4.2 but the admit ranges posted for the last few years has been higher so they probably do not cap the GPA anymore. If you calculate the maximum SLO GPA using 9-11th grades and an 8 semester honors point cap, the maximum would be around a 4.3-4.4.
MCA is still referred to in the SLO applicant review but no specifics on how it is calculated since 2013.