This is a build suitable for stationary strategies including a squad or a stationary frame, as well as camping in a suitable position on the map making the overall build more effective.
This build does not come with the kit hunter munitions + primed bane grineer so if you want more damage, use some skill to increase damage or remove enemy armor.
Corrosive damage increases the effectiveness of puncture damage by 75% so this is the best path for this weapon.
Galvanized Scope can be replaced with Critical Delay, this reduces the hassle of aiming at the target to trigger the additional critical chance, however be aware that using Critical Delay will reduce the rate of fire so you will need to have a external mod to fix this like Arcane Acceleration or Warframe Skill
The last four mods are the most suitable to be replaced by a riven mod but don't forget to keep the critical chance of 120% of Galvanized shot, the corrosive elemental combo or something close to the 60% of critical damage of Hammer Shot