No, the Holosun HS407C-X2 uses the Trijicon RMR footprint, while the P322 is designed to accept optics that use the RMSc or K footprint. Direct fit options for your P322 include the Sig Romeo Zero, Shield RMSc, Vortex Defender CCW, Holosun 407K/507K, Holosun EPS Carry and more.