drop the trigger group and clean the slide channels in the receiver real good. that takes care of the gritty slide most times. i bought a cheap 760 carbine a few years ago that barely cycled. i broke it down found a old cleaning patch jammed into the trigger group and the inside of the receiver was full of muddy looking gunk. cleaned the hell out of it and lubed it with remoil and it shoots 165 corelokts moa all day long.
