Beskar steel being resistant to lightsabers is some bullshyt, man

[null]

How the fukk did that Mandalorian chick forge Mando's armor in Season 1 if it can't be melted? You telling me that flame was hotter than a lightsaber?

because the strength of a material (metal in this case) varies at different points of the forging process.

aka the process of forging strengthens the metal .

"As the metal is shaped during the forging process, its internal grain texture deforms to follow the general shape of the part. As a result, the texture variation is continuous throughout the part, giving rise to a piece with improved strength characteristics."
Forging - Wikipedia

"Forged steel is generally stronger and more reliable than castings and plate steel due to the fact that the grain flows of the steel are altered, conforming to the shape of the part. ... The tight grain structure of forgings making it mechanically strong."
The Difference Between Casting Forging - ATC GROUP

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also: chemistry

example:

"Extraordinarily expensive to produce, Adamantium is created through the mixing of certain chemical resins whose exact composition is a closely guarded government secret. For eight minutes after the resins are mixed, Adamantium can be molded if kept at a temperature of 1,500 degrees Fahrenheit."
Adamantium History, Owners, & Powers | Marvel

remember:

some acids decompose plastics, some metals.

 

[Dorian Breh]

so basically you and op's problem is you don't remember alot of the stuff you saw in this show alone that answers these question.
1) for OP, you could clearly see in the duel in the final episode that the lightsaber was getting the beskar hot enough where it starting glowing red not unlike this

meaning given enough time, the lightsaber would have eventually melted it. it's resistant not lightsaber proof.


2) Regarding using the technology in guns. Which guns don't use this tech? literally every weapon fires a laser. not a single solid projectile has ever been seen in starwars

because the strength of a material (metal in this case) varies at different points of the forging process.

aka the process of forging strengthens the metal .

"As the metal is shaped during the forging process, its internal grain texture deforms to follow the general shape of the part. As a result, the texture variation is continuous throughout the part, giving rise to a piece with improved strength characteristics."
Forging - Wikipedia

"Forged steel is generally stronger and more reliable than castings and plate steel due to the fact that the grain flows of the steel are altered, conforming to the shape of the part. ... The tight grain structure of forgings making it mechanically strong."
The Difference Between Casting Forging - ATC GROUP

-

also: chemistry

example:

"Extraordinarily expensive to produce, Adamantium is created through the mixing of certain chemical resins whose exact composition is a closely guarded government secret. For eight minutes after the resins are mixed, Adamantium can be molded if kept at a temperature of 1,500 degrees Fahrenheit."
Adamantium History, Owners, & Powers | Marvel

remember:

some acids decompose plastics, some metals.

Man, I could've sworn I saw that armorer liquefy the Beskar in one of the episodes. The first time he gets a Beskar slab. Am I misremembering this shyt?

 

[null]

Man, I could've sworn I saw that armorer liquefy the Beskar in one of the episodes. The first time he gets a Beskar slab. Am I misremembering this shyt?

dunno. i have only ever seen 5 mins of the show.