The most powerfull version I'have played. 12 SL = more than 2 AC20 in dammage (45) withe a much better cooldown (2.25 VS 3.75)!!! 65 dmg alfa strike crd-6t
An alternative version : SNPPC => LPPC = Rang x 2 and better cooldown, less impact but still usable at contact. 12SL => 12SPL = 48 dmg every 2.6 sec with a little rang boot. SNPPC and SPL have very similar rate of fire (3 & 2.6), you can torso twist and alfastrike for 59 dmg! The alfa is little lower, but the rang is better and the cooldown is a little shorter. Problem, big part of your firepower is in your arm, avoid to lose it to quickly. crd-6t
https://mwo.nav-alpha.com/mechlab?b=88f5a055_CRD-6T This will give you a 30 damage mid range pin point option. I am afraid in close quarters, you will be hot and will have to use just the ERSLs after the first shot. That might be ok with short cool down 45 damage bursts. Also, better chance that your first shot could finish a damaged mech.
Replace ERSL by SL increase significativement your heat management 28% to 34%. You can perform an alfa and still brawl with your SL. crd-6t