There won’t be any issue. Still worse than many other classes. Depicting this as Double Tap is just shallow.
With 5% chance, you won’t see more than 2 procs in a 10 minutes long battleground. If you aren’t convinced, consider Windrunner’s Guidance procs. It has a %12 proc chance. How many times it procs in a bg?
Rapid Fire does around 140k to plate wearers. 140/2*2 = 140k overall damage increase for 10 minutes. People can’t analyse what they read nowadays (not to you).