This is the first comic in a long time that actually made me laugh out loud! I think 'Dakka' was a bit OTT. Maybe just 'dak' would be a good sound for a bolt pistol.
Amd also, I remembre soeone said something in another thread about why Harkon isn't in the proper colours. I'm of the opinion that, when 4th Ed came out, the LR crew was increased to 3 and he was taken from a tac squad and chucked into the 'raider. And if Frep's head hasn't been painted yet, the owner of the EPS sure as heck wont be arsed to strip off Harkon's pain and the re-paint him! Plus, I don't think Harkon would appreciate coming back to the Land Raider looking like Veteran Trooper Smik.