Go for level 3 Ceramic/Plasteel components then Chameleion Coating Easy Break Down with Folding stock all from Arsenal book
Yeah the problem is then this gun is so freaking expensive with such huge availability you cant ever get rid of it in emergency it is too damned cool. You will never replace the value. If I am carrying a AR I want to know I can dump it someplace if I have too when the heat is on and walk away without the attention. No matter how much cermaic and chamaleon it has it will draw attention fully put together and in your hands.
Go for the executive protector SMG and MAD proof the briefcase, act like you are some kind of high end corporate courier. Much cheaper route. Skip the sword too, get a ceramic knife and chameleon coating on that is fairly cheap, tuck it in a concealed sheathe and now you have an extremely hard to find weapon on your person for melee.
In general big weapons seem cool because they have big numbers but with way too many jobs they also bring big risks. It is better to go for slightly smaller numbers that you know you can reliably carry around with you without drawing too much public attention. That has been my theory ever since we stopped all playing troll street sams in middle school and it has served me pretty well
No offense to troll street sams, but a whole party of them is pretty pointless and limited