One rail gun and a roller muzzle is all you'd need. It wouldn't take long to swap out the muzzles
Well and bands for each muzzle type.
Yep, took me like 2 hours total to switch out a RA 110 (with ET) to a roller.
Problem was I did not have an UNDERWATER chronograph to measure REAL spear speed. IMO, all this number crunching and math is USELESS unless you have chronographed spear speeds from each gun to PROVE the difference btw roller and conventional spear speeds. To this date NO ONE has chronographed these spear speeds comparisons.