How do I get level 15 advance weapon extensions for striking, and range?

[Basras]

So yeah starting that Zeig CO for the 11* weapons.

[Shinamori]

Crafting. Craft the weapon until you can't go any higherr thsn your current extend level. Then request the other levels.

[Basras]

Crafting. Craft the weapon until you can't go any higher than your current extend level. Then request the other levels.
Yeah but how do I get the extension for the level 15?

[PokeminMaster]

Just keep crafting the weapon to EXLv.14 to unlock the achievement that grants you level 15

The number of times you need to do that varies by the weapon's rarity

[Basras]

Just keep crafting the weapon to EXLv.14 to unlock the achievement that grants you level 15

The number of times you need to do that varies by the weapon's rarity
So how many times do I have to do it?

[Fusionxglave]

you have to do it a lot and it can be costly.

However if you do your daily crafting your achievement for lvl extension goes up really fast.

[PokeminMaster]

So how many times do I have to do it?
Again, it depends on the weapon's rarity... for instance, to get an 11* weapon to EXLv.8... I have to get one to EXLV.7 25 times...

But a 1-3* weapon should take maybe 5 or so to continue from wherever it stops (I guess it stops at around 14 then?)

[Sacrificial]

swiki (http://pso2.swiki.jp/index.php?%E3%82%AF%E3%83%A9%E3%83%95%E3%83%88%2F% E6%AD%A6%E8%A3%85%E3%82%A8%E3%82%AF%E3%82%B9%E3%83 %86%E3%83%B3%E3%83%89%E3%83%AC%E3%82%B7%E3%83%94)

Third last chart