I use a regular 22 rimfire rod with the brass brush from the front while the barrels are on TDC. Then push an oiled up patch through each. This only take a few minutes to do all of the barrels like this. You should wipe down your bolts with a silicone rag and put a dab of grease on the bushings and bearings. When you assemble your crank, put a little grease on the shaft and gears also.
bruski