JNL PRX III Tuner
*Can't be bored bigger than .950
*Set your Tuner with the Purdy Prescription as oultined by Tony Purdy in the 9th Harmonic
*Measure your exact barrel length from the breech to the muzzle and we will set it for you.
*Our setting should be within a 1/2 turn in either direction.
*Greatly simplifies your tuning procedure
*3 Nylon Tip Screws to lock down your tuner once it is set
*We will set it for you before shipping or here is the formula to set it your self.
27" Barrel = 3.099 in tuner length
26" Barrel = 2.974 in tuner length
25" Barrel = 2.849 in tuner length
24" barrel = 2.724 in tuner length
23" barrel = 2.599 in tuner length
Tuner is adjustable from approximately 1.675"-2.075" in length
Each number on tuner is .001" longer
Add the .5", 1.0", or 1.25" Extension to get the appropriate length
One extension comes with the tuner at no extra charge