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John, simple directions for tuning 1720/1701p.

July 15 2017 at 12:21 PM
Tommy   (Login shambozzie)
YF12


Response to tuning with the chronograph

First if you are looking for power gain inlarging the tp is the way.you have two adjustments. 1.Hammer spring and 2.is the stroke adj. Back the stroke adj out to zero.
You won't be using it anymore. Hint blue lock tight. You have approximately 7 turns from zero with the hammer spring adj. Start at 4 turns. Adjust according to fill pressure and
Fps. The hammer spring is your final and only adj from now on.just tuned my 1701p. 1.bstaley mod.3 #113 orings. 2.replaced stock tp .043 with 1720 tp .067.3.stroke =0. 4.Hammer spring =5. Jsb 8.4 @ 670 average for 30 shots. Nice cloverleaf @ 35 yds.

 
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