Nine choke constrictions let you precisely match load and shooting conditions. Minimum gap geometry and high resolution “RMS” interior finish gives less pellet deformation; consistently tighter patterns. Choke constriction is laser marked on color coded band, no need to remove tube to verify size. Long tube with hidden wrench slots extends beyond the length of the muzzle. Knurled grasping band speeds installation and removal. Helical rifled Diffusion spreader tubes provide a pattern that’s more open than cylinder.