After the start of Chapter 2, don't do any tasks. Go to Valentine's Clinic, which is next to the tavern. You can look through the back window to trigger the robbery mission. Go in and kill them all. Then you can get a revolver on the table with attributes. All great
Near Lemoyne Swamp, there is a house between M and O. Go inside and get a double-action revolver under a bunk bed, which has pretty good properties.
On the upper right side of Annesburg, there is a hermit's house. Go to the door for the first time and get a gun. Wait for him to go out and kill him as soon as the Eye of Death opens. But note that there is only one chance to get a rare patterned shotgun. , excellent properties. It is recommended to save a file at the door
There is a gang camp under the capital letter B at the top of the map at the snowy mountain. Save a file when you go there, then go to the second floor to get a shotgun with pretty good attributes.
In Rhodes's gun shop, go to the side and there will be a boy asking for help in the basement. Go in and rob and go to the basement. There will be a Lancaster repeating gun. It has good attributes. A single shot of Dead Eye can kill six or seven people.
The above is a guide to useful weapons for free in Red Dead Redemption 2. I hope it can be helpful to everyone.