FF,
Bought a Barrel roller for mine, and picked up about 5 FPS in the swap.It has little ball bearings inside it that runs along the slide.
I don't know what they are called but it simply replaces your old slide, and works very quietly. Your bow guy at the shop should know what they are called and should have them there. I think I paid about 7 or 8 bucks for mine.
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