BRG3,
Dont lube the magazine tube that the action rod collars slide on, all that does is collect dust and carbon up quicker. Instead, when it starts to carbon up from shooting, take 0000 steel wool and polish the magazine tube, then leave it dry. Clean the inside of the action bar collar the same way. Polished carbon is slicker than any lube you can put on it and it wont gunk up quite as fast. Try turning the ring that the o-ring is on over then shoot the low brass loads. Hope that works for ya.
Jim