Sad, how the sets get another line(Almarian and Heater shield), the Bomb 4 lines(Nitromome is the only Viable one), the Sword 2 (levi and CIV) yet the Blaster has only one line(Valiance). So, lets throw in some ideas!

My first idea: Spiral Infector(normal with poison)

Would branch off from master Blaster.

5
Spiral infector
Normal
Description: a Master blaster modified to blast a Kinetic Vitrol Blast.
Attack: three green bullets. Charge: a Larger blast.

My other: Sonic Cannon line. Works similar to the Blaster line but deals pierce and can inflict stun and is the fastest Bullets of the Blaster lines.

Branches off from Blaster

3* Deci-Blaster
Piercing
Description: An amp modified into a gun that can shatter eardrums.
Attack: Three grey bullets that can cause stun. Charge: A large grey bullet that can cause small knockback and stun.

Deci-Blast 4*
Piercing
Description: a Deci-Blaster that was Mod Calibrated to shoot larger bullets.
Attack: More powerful than the Deci-Blaster.

Sonic Cannon 5*
Piercing
Description: A Gremlin Amp that its mod was calibrated with the attibute of sound. It has three settings: Stun, Kill and the Grand Colony Deaf Knocker's Choir's Best hits.
Attack: More powerful than the Deci-Blast and the charge can Cause a small explosion when it collides with somthing. The impact has a chance to make a noise similar to the Gremlin Knocker's Grunting/laughing and some screeches.

Wiltaton Suggested this:

4*
Salt Balster
Normal + high vs slimes
Description: Modified blaster to have salt bullets.
Attack: three white sparkling bullets. Charge: Large white sparkling bullet.

5*
Ionized Salt Blaster
Normal + high vs slimes
Description: Favourite gun of Spiral Geological team when they need to go deep in Lichenous Lair.
Attack: Same as 4*, maybe more sprakling. Charge: Same as 4*, maybe more sparkling.

(Will update later!)