When designing the PMA Barrel Tuner we consulted with shooters in the benchrest community added this knowledge to our own experiences in both rimfire and centerfire competitive shooting to create what we believe is the easiest to install, tune and clean barrel tuner available.
There are a lot of things we like about rimfire tuners that we've integrated into our design to address some of the shortcomings we've experienced with current offerings in centerfire tuners.
This tuner features an appropriately sized moving weight and a lightweight center tube with no exposed threads, no lock rings or clamping screws. The center tube tightens to the barrel using a 1" hex. Tension for keeping the tuner weight in place is accomplished with silicone o-rings. Additional vibration dampening is also accomplished with the use of multiple large cross section silicone o-rings on the outside circumference of the moving weight. The laser engraving is marked to correspond with .001" of movement and marked counterclockwise so the numbers get larger as the weight is moved out.
Thread pattern for the barrel is 7/8-32 x 1". Includes blueprint diagram for installation and suggestions for tuning based on our experiences with the 6mm PPC.
PMA highly recommends installation to be completed by an experienced gunsmith.