I have the Omer 100cm and noticed after my first couple of shots that the shaft was etching marks on the barrell and the gun was shooting low. I put a shaft guide in and that has alleviated the problem slightly as I can move this up and down and change the vertical angle of the shot.
My next step is to incorporate a rail so there is no shaft whip at all.
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Shaca
www.medfish.com
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