To enter the back of the gun store in a short walk in a pretty town for Bill in Red Dead Redemption 2 plant dynamite on the back door of the gun store.

All Red Dead Redemption 2 Guides

Plant dynamite on the back door of the gun store to enter the back of the gun store in a short walk in a pretty town for Bill in Red Dead Redemption 2

Then go into the blown up door to enter the back of the gun store.

Next: Search Cemetery for Grave Robbers