Try the following settings.

Ambush
Main weapon: PPSH - 41 with aperture sight
Side arm: Magnum
Primary grenade: Molotov cocktail
Secondary grenade: Tabun gas
Perk 1: M2 Flamethrower
Perk 2: Overkill
Perk 3: Reconnaissance
Vehicle perk: Coaxial Machine Gun

Sniper
Main weapon: PTRS - 41
Side arm: Magnum
Primary grenade: Molotov cocktail
Secondary grenade: Smoke
Perk 1: Bouncing Betties
Perk 2: Stopping Power
Perk 3: Steady Aim
Vehicle perk: Coaxial Machine Gun