Umarex Old Noob got a NOTOS - detuning?

[graycrait]

When my young TN friend visited me in Iowa this past weekend he provided me his FX Streamline .22 which is deathly quiet like my custom tuned AA S200 .177. He also gave me a NIB Notos and said it probably needs a slight detune as he suspects they max these things out at the factory. I've got a chrony, the tools, and some rudimentary knowledge of PCP air rifles. How "low can I go" or can't I improve efficiency (noise) by merely adjusting the hammer spring screw? I have no plans on shooting this Notos past 35 yrds and it will have a red dot on it to keep it light and "handy."

 

[Dairyboy]

I detuned mine to 15fpe. Cut a few coils off the hammer spring and lowered reg set pressure. Mines setup the same for close range pests with a red dot.

 

[graycrait]

I saw the video! Seeing as I haven't aired this thing up yet I think I'll just do what they showed in the vid and then start in cutting a coil and a half and turning down the reg pressure a bit.

 

[Rizz01]

My Notos has been shooting JTS 18.1 grains laser accurate out to 50 yards at 695 fps since it came out the box. Surprisingly quiet as well.
If you dig into some past posts, the only way to detune it is to cut down the hammer spring. The adjuster alone has very little impact on velocity.
For shot count most folks are getting a drop block and a bottle.
#Firewalker is the resident "Guru" here when it comes to this gun......... You can even ship him your gun so he can tweak it. He does some amazing stuff with the Notos. He will definitely respond to this thread soon.

 

[graycrait]

I guess I will wait till my red dot gets here and shoot it over the chrony before I fiddle with it. I'm familiar with Fire Walker and admire his work. He and I even discussed a conversion to .177.

 

[Firewalker]

You all just about covered everything but hammer weigh.

I'd reduce hammer weight before I'd cut the hammer spring.