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I used to use white lithium grease on everything where grease was needed, but the past two years I've been using Gun Slick's Annhydrous Graphite Lube on just about everything (yes, have even used it on piston head O-rings as well as my CA M24's rubber piston head and has not degraded the rubber at all over a two year duration)............ works amazing on GBB slide rails, and 20 or 30 weight silicon oil where oil is needed.
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