Hatsan Flashpup velocity adjustment

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boogermeister

boogermeister

Member
Jul 28, 2018
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24
missouri, United States
I recently acquired a Flashpup, and I would like to lower the velocity a bit as I do not need maximum speed for my backyard. I thought I would be able to get a few more shots per fill at the same time. I was going to try to adjust the valve (hammer?) spring as that is the easiest but cannot figure this design out. I am used to my Marauder, that is a straight forward design. Anyone have the knowhow with this gun to tone it down a bit? Could use some help please! Thanks-----
 
Might want to look at adjusting a bt65.. Probably the same set up .. Remove the stock.. On the side of the reciever the is a allen head set screw.. Take the set screw from the side out and lossen the inner one.. Then from the rear of the action screw the large allen head to loosen or tighten the hammer spring.
 
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I did adjust the velocity on my Flashpup. Factory ran an average of 971fps. I turned it down too much, got an average of 575fps. Turned it up and got 710fps. I will mess with it some more tomorrow, I was aiming for 650fps to shoot about the same as a HW50. This was with Crosman Premier hp 14.3gr. I will use these as a standard for velocity adjustments. Then starts the bench testing of pellets, I have an assortment of JSB's, H&N's and bought a tin of Vortex domes, heard they are the same as h&n FTT's. Need to chrono a few strings to get shot count, and see if it increased any. Velocity is more consistant with the speed turned down. I do see a regulator in this guns future.
 
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