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Etched Bullet Casing
The Etched Bullet Casing is an event currency in Arknights.
The collectability of a bullet depends on its caliber size. As to why an empty shell can be traded for goods in a dessert shop—You must understand that, as the most popular destination among locals, Lateranian Desserts has always been more than just a dessert shop.
Usage[edit]
A spent ammunition casing of Lateran firearms — likely of a rifle cartridge based from its shape and size, Etched Bullet Casings can be obtained and exchanged for various items at the Lateranian Desserts during the Guide Ahead event.
How to obtain[edit]
Etched Bullet Casings are awarded as the first clear reward of all GA operations and as the regular drop of Summit of Nations operations.
The best GA operations to farm Etched Bullet Casings are GA-6, GA-7, and GA-8 due to their above-average 
Sugar Pack, 
Loxic Kohl, and 
Coagulating Gel drop rates, respectively.