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We study type IIA orientifold compactifications with fluxes that give rise toperturbatively stable, non-supersymmetric AdS$_4$ vacua with D6-brane gaugesectors. Non-perturbative instabilities can be mediated by D8-branes wrapped onthe six internal dimensions $X_6$, if they reduce to 4d membranes with a charge$Q$ larger than its tension $T$. The mismatch $Q \neq T$ arises due to i)curvature corrections and ii) the BIon backreaction of D6-branes wrapping3-cycles of $X_6$. We give a simple expression for the second effect intoroidal orientifolds, and find that only pairs of 3-cycles at SU(2) anglescontribute to it. They either contribute towards $Q>T$ or $Q<T$ depending onthe 3-cycles separation, allowing to engineer 4d $\mathcal{N}=0$ vacua intension with the Weak Gravity Conjecture for membranes.

Membranes in AdS4 orientifold vacua and their Weak Gravity Conjecture