Shrewsbury

"Leading manufacturer of firearms since the 19th century, including the rifle that either "won the West" or "slaughtered the indigenous population of the West" depending on which state you go to school in."

- bawsaq.com description Shrewsbury is an American firearm manufacturer in Grand Theft Auto V. The player can buy stocks from then at the Bawsaq.com website.

Overview
Not much is know about Shrewsbury, they are only mentioned in the Bawsaq website, as one of the bussinesses with stocks available to buy. They are said to be a firearm manufacturer since the 19th century, and their weapons were used in the West during the same century, hinting it is possibly based on Winchester.