Circle G

Circle G was a pre-War company that manufactured firearms and ammunition.

Background
They manufactured .308 rounds, .38 rounds, .44 rounds, .45 rounds, .50 rounds, 10mm rounds, 5.56mm rounds, and 7.62 rounds.

Appearances
Circle G's products appear in Fallout 3, Fallout: New Vegas, Fallout 4, and its add-on Nuka-World

Behind the scenes
They have been dubbed Circle G by fans as their logo, a circle encapsulating the letter G is the only form of identification that can be seen on their ammunition boxes and there is no mention of the company anywhere else in the series to confirm the true name of the manufacturer.

Circle G