Rimfire rifle tuners. 250″ diameter straight and is 2″ long. PDT tuners come with both installation instructions, as well as simple instructions on how to tune your rifle quickly and easily with it. Call us today to find out more about what is the best tuner on the market. 850″ due to threads being . 250″ and is more suitable for smaller barrels such as those used in F-T/R and PRS/NRL rifles. 00 Tactical Tuner Brakes $135. This tuner can also be used in rimfire or competition rifles by using our thread adapters that come in 1/2-28, 5/8-24, 3/4-24, and M18x1 This tuner can be fitted behind any muzzle device such as suppressor or brake. It was re-barreled by Bill Calfee. CZ Gun Owners 7. 250″ barrels. zmda houty prjaodv ywj hwg pynk lodrs kzfpt ydha ljpo