Alright, it's been over a year since I drew my Avatar-themed Railgun ( https://www.furaffinity.net/view/55197897/ ), so, rather than doing something new, it's time for an update. This is less of a redesign, and more of an elaboration of the inner workings and severe drawbacks.

First, I fixed a mistake I caught too late, with the scale in place, the caliber is not 30mm, it is 50mm. This is now adjusted. While the projectile is still 30mm, it is now resting in a 50mm conductive discarding sabot. I also added black to the barrel where the Unobtainium rail would be visible. I also up-scaled the weight massively. From 35 kg (77.16lbs) to 150 kg (330.69lbs).

I reworked the Recoil spring to be a combination of 3 Twin-tube liquid shock absorbers (as one would find on vehicles), and a rubber pad to try and curb the immense kick of the weapon. And even then, it can cause damage, including bone fractures, when it fires. Additionally, right after I finished it, I learned the Twin-tube design is the most failure prone design next to the mono-tube and bypass design. However, it is also the most cost-effective, so I say it is on point.

Next, I changed the mid-section. I moved the battery down by 5cm (~2in) to open up more room inside the gun for internal workings. The big addition here are the Supercapacitors (SCs).
Simply put, the battery would, likely, be unable to discharge enough voltage and current in time to launch the projectile correctly. So now the front, where the panel is located, has 3 massive super capacitors (3cm (1.18in) diameter, 20cm (7.87in) long) on either side.
They are all wired to a solid-state switch which is connect to the trigger. When the switch is OFF, the SCs draw power from the battery to store and discharge all of it into the lower rail when the switch turns to ON. They can charge in pairs of two, and it is tracked on the scope.
Unfortunately, despite this battery being a massive 60cm x 50cm x 15cm (23.6in x 19.7in x 5.9in), the gun will drain it completely in 10 fully charged shots.