Blue rarity shaders only have a chance to drop, it is not guaranteed.
Unfortunately it has been the same for other badges such as Refurbished Black Armory for the Black Armory badge.
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Thank you for your quick reply. I didn't thought their was, beside looting the right weapon, have the chance to drop the shader upon dismantling. I have been lucky so far that the shaders I was looking to previously, dropped first time I guess. I guess I need to keep grinding. But 560 hours in the game and neither of thoses shaders dropped somehow had got me questionning.