Although these are referred to as "new weapon techs", no additional research or Proving Grounds projects need to be done to build them. Follow your typical research progression and you'll unlock them.

• Enhanced Laser: Enhanced Lasers are a step up from standard laser weaponry, and offer their own advantages and disadvantages compared to our standard magnetic weapons. The Enhanced Laser series of weapons specializes in accuracy, consistent damage, noise reduction and armor piercing. Critical hits, armor shredding, terrain destruction and overall damage potential are lower compared to Prototype Plasma weaponry. Enhanced Laser weapons are unlocked alongside Magnetic Weapon and Gauss Weapon research.
  
  
• Master-crafted Laser: Master-crafted Lasers double down on the traits of Enhanced Lasers, and offer their own advantages and disadvantages compared to standard beam weapons.The Master-crafted Laser series of weapons specializes in accuracy, consistent damage, noise reduction and armor piercing. Critical hits, armor shredding, terrain destruction and overall damage potential are lower compared to Turbulent Plasma weaponry. Master-Crafted Laser weapons are unlocked alongside Beam Weapon research.
  
  
• Prototype Plasma: Prototype Plasma weapons are a cutting-edge alternative to our standard magnetic weapons, and offer their own advantages and disadvantages compared to them. The Prototype Plasma series of weapons specializes in critical hits, damage potential, terrain destruction and armor shredding. They typically do not pierce armor as well, are inaccurate, loud, and have wildly inconsistent damage unlike the Enhanced Laser series of weapons. Prototype Plasma Weapons are unlocked alongside Magnetic Weapon and Gauss Weapon research.
  
  
• Turbulent Plasma: Turbulent Plasma weapons double down on the traits of Prototype Plasma, and are a cutting-edge alternative to our standard beam weapons. The Turbulent Plasma series of weapons specializes in critical hits, damage potential, terrain destruction and armor shredding. They typically do not pierce armor as well, are inaccurate, loud, and have wildly inconsistent damage unlike the Master-Crafted Laser series of weapons. Turbulent Plasma weapons are unlocked alongside Beam Weapon research.

In addition to the new XCOM Weapons, some existing XCOM weapons have new variants available from these technologies. Only the Turbulent Plasma SMG is available to supplement the Turbulent Plasma series. For the Master-Crafted Laser series, however, there are:

• Master-Crafted Laser SMG
  
• Master-Crafted Heavy Railgun
  
• Kal-LX Bullpup
  
• Eclipse Lance
  
• Master-Crafted Laser Autopistol
  
• Master-Crafted Laser-Edged Ripjack (this one features the same ability as the Master-Crafted Laser-Edged Sword).