My team set up a shooter on 80/20 rails so we could adjust compression, then we used H beams from Mcmaster as thr walls. On one side we had 2 cims that had the 6 inch super grip wheels from andymark. On the other side was another H beam that had a strip of Poly Urethane Belting from mcmaster. We have it so the wheels make enough contact on the Frisbee so once it touches the wheels it remains on at least one till it exits. Then its compressed up to the wall with urethane belting. We were able to shoot about 60 feet. Its a little much but we'd rather shoot further then shorter

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