>>96478121
>How is 2020 in comparison?
Even more clunky. We tried RED and 2020. RED's rules were at least more streamlined, better explained, and better organized. 2020 is hard to navigate, has rules spread out everywhere, has many disparate rules that directly contradict each other, and if you try to find an answer online you'll get three different answers for the same question. But we still ended up switching from RED to 2020 because it had a whole bunch of more content and we didn't like the general feel of RED.
2020 is generally more lethal, since TNs for ranged attacks are a lot lower, Autofire gives a bonus to hit and can easily score dozens of hits, Called Shots to the head are half as difficult (-4 to hit, instead of -8), random hit location means any untargeted attack might sometimes score a headshot anyways (a 1-in-10 chance), you can't dodge bullets without special cyberware (you need Reactive Body Plating and the attacker needs to be using a smartgun or an electronic targeting system of some kind), longarms deal more damage (e.g., carbines are 5D6, full-power rifles are 6D6, and anti-material rifles are 6D10), all damage has a chance to stun (roll Body to resist and recover), and everyone risks death after only 12 points of damage.
Meanwhile, armor generally gives more SP (about ~50% more on average), armor can be layered for a small bonus to SP at an encumbrance penalty (up to +5 SP per extra layer, if all layers are within 4 SP of each other), and the Body attribute gives a small reduction (from -0 at Body 2 to -5 at Body 12) to damage instead of adding more Health.
>If not, how is Shadowrun for gun autism?
I'd say Shadowrun is even better for gun autism, since you have like a whole bunch of gun modifications available and up to half a dozen slots to mount accessories. My rec is 5E for maximum autism. Combat is not as deadly as 2020, but still deadlier than RED. Personally, of the three systems, I like Shadowrun best.