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