>>64472197
The real 1300IQ move for a 5.56mm weapon to replace a P90 for this would be the Steyr AUG, IMO.

>replace progressive trigger with proper fire selector
>optionally look at replacing the scope with a red dot of some sort
>maybe carry the rifle with one of the 42rd extended mags in it, and then 30rd mags as reloads
>have a handy rifle which mogs the fuck out of the P90 in basically all aspects
>also doesn't deafen or blind you like the Olympic Arms mini carbine does in some circumstances
>could use a shorter 16" or 14.5" barrel to make it even shorter and lighter, and STILL be far better than the P90 and Carter Special
>still looks fairly futuristic by 1990s standards