This is where overhauling the specs, specifically the scale length, came in. Paul Reed Smith: Pre-Factory Guitars & the Stories Behind PRS - YouTube Watch On“We made the horn stick out farther. Aside from crafting a model with a unique scale length to compete with the guitar giants, tuning stability and accuracy were front of mind. All these decades later, a 25" scale length is still the primary choice for PRS models – although other considerations were in the mix. “I’ve always been surprised at how well it worked – especially when I saw other companies building 25" scale fret-slotting machines,” he said.