When a guns’ slide and frame are made of different metals, the potential for metal galling is a real danger to the guns reliability. To eliminate this threat, Bill’s Custom Automatics uses the Accurail system in all of its titanium based guns. This system literally puts the slide and receiver on a rail system that is custom machined for each pistol. This rail system completely eliminates the potential for galling and makes the slide and frame smooth as glass and perfectly fit.