  We prove the existence of infinitely many solutions to a fractional Choquard
type equation \[ (-\Delta)^s_p u+V(x)|u|^{p-2}u=(K\ast g(u))g'(u)+\varepsilon_W
W(x)f'(u)\quad\text{in }\mathbb{R}^N \] involving fractional $p$-Laplacian and
a general convolution term with critical growth. In order to obtain infinitely
many solutions, we use a type of the symmetric mountain pass lemma which gives
a sequence of critical values converging to zero for even functionals. To
assure the $(PS)_c$ conditions, we also use a nonlocal version of the
concentration compactness lemma.
