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Old January 13th, 2009, 19:33   #10
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Join Date: Jan 2004
Location: Red Deer, AB
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Bearings are what you might be thinking of. Ball bearing type bushings are designed for high rate of fire (ROF) guns but typically won't stand up to a high fps spring for long. I have plenty of remains of internals in my shop from clients who though otherwise to testify to that. High fps springs should use a good quality solid metal bushing.
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