This is the build I've been using to farm P93 solo caches. Based around taclink, but without a 6 piece classified requirement.
Guns: Make sure determined and commanding are your free talents or else the build doesn't really work. Also highly recommended that one of your guns has predatory on it, it helps with survival after wave 8. Destructive recommended on both guns, then either vicious/responsive for the other. I've been playing with vicious more lately, as I don't get within 10m often (its closer than you think) and my health is pretty topped up. If lots of enemies are on the screen while taclink is up, I'll empty both guns to avoid reloading while your steroid is going.
Stats: Recommend at least 5k stam for survivability during data breaches, I run 6k.
Gear: The only hard requirement is 3 piece Alpha Ninja. I highly recommend always using a Nomad piece unless you have health on kill rolled on your gear. D3 is for the elite damage reduction for extra survival against shotgunners. Could swap it out for Sentry/Striker for the accuracy/stability bonuses. Crit mods work too if you don't have DTE. Also, try and use whatever pieces you have classified versions for. So if your nomad chest is classy, and you have classy alpha gloves, make the switch.
If you don't have ninja, 4 piece Alpha 2 piece Nomad works too.
Easily does 4 by wave 10 even with mediocre play, 5 if you get some good RNG, otherwise easily achievable by wave 11/12. Gameplay video to come.