recoiling photons evidence?

When a bullet and the exploding gas shoots out of the barrel of a
gun, the gun moves in the opposite direction at a lesser velocity
because of its greater mass according to conservation of
momentum..
But the emission of a photon which has no mass except the
ascribed E/c^2 is not quite the same.
Instances of light pressure on reflective surfaces and Compton
like scattering of xrays at lower frequencies with the missing
energy transformed into the linear movement of the electron
suggests a recoil of the electron but not of the photon.
What is the evidence for recoiling photons?