What's a good gun to replace the typhoon

Harrier though it makes things a bit too easy. PPR has a ramp up, but after it get's a 4x multiplier and has unlimited ammo. The ramp up is worth the dps, you just need to master soft cover. Saber may be what you are looking for. It has damage somewhere between the viper and valiant and no hip fire penalty. It does require good aim and phasics to get the most punch.

Out of the smgs, the hurricane has ridiculous dps once you master the recoil. Ap barrel and heatsink are a must.

Snipers are good but it does require good aim and quick shooting. The bw and jav are the best at what they do. They too need phasics to make the most of their power.

Practice will be the best thing because without the skill no gun save the harrier will be worth a damn.

Venom.

The revenant.

The Typhoon is not suitable for CQC. If you are frequently getting close enough to be staggered by Marauder elbows, I would suggest a Claymore instead. Blowing off heads in one shot is extremely cathartic.

Avenger

Fire up your Lancer with your HVB and Extended mag and some decent ammo, like incendiary.

<Gun Name>

Shuriken

...with explosive ammo

Arc Pistol

Harrier, lancer for that playstyle if you like ARs
Talon, arc pistol are some all purpose pistols that are awesome. Arc pistol does have a charge up.
Claymore, wraith, graal, etc all good shotguns

I haven't played the destroyer much, but lately I like him 06666 with no DM. The missile is much fun, and I don't like no-dodge and slow run.

Is the Destroyer stagger-immune even with no DM, or is that a feature of DM?

Spitfire is similar but much cuter, tickly even.

If you want easy mode, go 60666 KroSent with Spudfrier AP mod + HVB Warp Ammo, Claymore HVB (sidearm lol), Grenade Gear.

It is boring, but as long as you avoid sync-killers, you will never die and you will kill all the things.

Spitfire is surprisingly effective against Phantoms.