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The existence of the mass gap is currently being challenged by the detection of GW190521, with a primary component mass of $85^{+21}_{-14}$ M$_{\\odot}$. Here, we investigate the main uncertainties on the PI mass gap: the $^{12}$C($\\alpha$, $\\gamma$)$^{16}$O reaction rate and the H-rich envelope collapse. 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The existence of the mass gap is currently being challenged by the detection of GW190521, with a primary component mass of $85^{+21}_{-14}$ M$_{\\odot}$. Here, we investigate the main uncertainties on the PI mass gap: the $^{12}$C($\\alpha$, $\\gamma$)$^{16}$O reaction rate and the H-rich envelope collapse. 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