Hello there,

As per Wiki:

• Kuva Nukor: Improvements to its already great critical multiplier and status chance; beam chains between multiple enemies.
• These weapons have a max rank of 40. To obtain the maximum rank, the player must polarize the weapon five times, with each Forma increasing the maximum possible rank by 2 (similarly as the Paracesis).
• All Kuva weapons deal innate elemental damage in addition to physical damage. The amount of this damage is random, ranging from 25-60%, while the type of element is determined by the Progenitor Warframe, as per the table below:

According to the above, I added exactly 5 forma to this weapon, so we can obtain Mastery Points from it.

In this case, I recommend picking Magnetic as an elemental. "Now, We COOK"!

Some info about this weapon:

• Innate Radiation damage
• Beam can chain up to 2 nearby enemies within 9 meters from the initial target
• Enemy corpses will still allow the beam to connect to nearby enemies
• Pinpoint accuracy
• Consumes 0.5 ammo per tick of damage
• Damage ramps up from 30% to 100% over 0.6 seconds when firing. After firing stops for 0.8 seconds, the damage decays back to 30% over 2 seconds
• Very low Critical Chance
• Limited range of 29 meters
• Pulsing weapon effect blocks the reticle, making it harder to make consistent headshots with the weapon shooting at moving targets
• Enemies damaged by Kuva Nukor have an invisible proc called Microwave applied to them
• Microwave procs cause the part of the enemy hit to become larger
• Microwave procs have infinite duration, but the visual effect does not

I'm aware that [Nukor] is not a Critical Chance based weapon, but believe me, "It just works".

There are several ways to make use of the Kuva Nukor's high Critical Damage by adding flat Critical Chance bonuses:

• An Adarza Kavat with Cat's Eye can give your weapons an additive 60% boost to Critical Chance.
• Likewise, Smeeta Kavat with Charm can guarantee orange Crits as one of its possible effects.
• Using the Secondary Fire of the [Mutalist Quanta] and afterwards firing the Kuva Nukor through the orb adds a flat +25% Critical Chance, in addition to +25% Critical Damage and extra Electricity.
• Harrow's Covenant can add up to +50% additive Crit Chance, or +200% on headshots, after absorbing enough damage.
• A fully ranked Arcane Avenger will grant a +30% flat Critical Chance buff when your frame is hit. Equipping two can combine for a maximum of +60% flat Critical Chance.
• With a maxed [Primed Target Cracker], the [Kuva Nukor] can achieve a Critical Damage Multiplier of 10.5x, the highest Critical Damage Multiplier value achievable outside Red Crits.

Enjoy, THeMooN85