I don’t know the name from any forums, or at all, but that only means that I don’t know the name.
Playing in Google found Pistol River is a real place in Oregon.
for example; https://oregonstateparks.org/index.cfm?do=parkPage.dsp_parkPage&parkId=55
Pistol River State Park is set in the dunes of the southern Oregon coast. The river supposedly got its name when a militia soldier lost his pistol in the river during the infamous Rogue River Indian War. In March of 1856, a decisive battle was fought here.
The dunes and the river system that feeds them are what make this area unique. During the spring and summer months, the dunes actually grow. The river has changed its course numerous times in recent history and pothole ponds attract waterfowl and shorebirds making this is an excellent birding locale. Ocean windsurfing is so good here it has become the location for several national championships.