Rifling is actually the spiral twist inside the gun barrel that spins the sheel to improve it's rnage and accuracy. What you're thinking about is a recouperator...
I also agree the barrel is way off. I'd suggest scrounging an Earthshaker cannon from somewhere and using that (perhaps you could buy a Basilisk and Covert it into a Griffon if you don't have one already - I'm sure self propelled artillery would look really cool on those converted chassis).




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. The conqueror also has a co-axle mounted storm bolter (iirc you can also take either a heavy stubber/storm bolter on a pintle mount as well as an upgrade).
t-tauri
