Hi there first time uploading in here. I stumbled upon this while messing around in smurfy. I like the efficiency of this build, shoot the Gauss at range finish them off with the SPLs packing AC20 force. Armor is nearly maxed XL255 will get you to 90.9 KPH and three JJ are enough to poptart with.
Welcome to MechSpecs, @Polaris Wind! Please insert a "s" after the http, so it becomes https - that will display the cribsheet properly. Gauss is a fine weapon for mediums these days, it's all too easy to get killed as a mediums armor will only take a partial alpha from assaults nowadays. Which is why I am not too keen on small lasers on a chassi carrying XL engine and a explosive Gauss Rifle. If it goes, you're likely dead by chained explosions aswell. I prefer a bit more range to go with my Gauss.
Swapped out the SPL for ML. Dropped armour, 2 JJs and put in a bit more ammo and a heatsink. Even after losing your gauss rifle the 5ML can still pack a punch. Recommended modules: Gauss cooldown and ML range.