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Stroke: ca 74mm, a bit difficult to measure. Can probably be stroked 3-5mm if one relieves the cocking groove in the piston.
The 7,5joule spring measures 2,9mm wire, 14,6mm coil ID, 33coils counting the ground endcoils.
Made a brass TP sleeve, to 3mm. Less slammy, but the velocity is the same with the 7grs Geco.
Tested 7.33grs JSB, and the consistency is amazing; extreme spread of 6fps, 674-680fps.
Perhaps the spring is the limiting factor now?
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