We had full control of the first period at Loftus Road on Tuesday night thanks to strikes from Jack Roles and Reo Griffiths, only to concede to Kingsley Eshun after sloppily losing possession just before the interval.
However, we snapped back into action on the resumption and Samuel, who caused all manner of problems for Rangers with the ball at his feet on the night, set up Roles to restore our two-goal lead just 23 seconds into the second period.
From there we saw the game out comfortably with George Marsh completing a 4-1 win to book a fifth round clash with Norwich City.