Here's the guide, as taken from a link Vindi left. I believe the original was posted here, but got deleted by mistake.
(
http://www.ukairsoftzone.co.uk/forums/topic/5319-barrel-polishing-guide/)
As my guide to barrel polishing has been deleted on the other forum it can no longer be linked to via my DMR guide, so here is a new version that should be refered to when following my DMR guide.
You should really polish your barrel after every skirmish regardless of how often you used the rifle, and you should also take time to polish the barrel in a new rifle, as you can never be sure of what nasties the manufacturer has left in there.
What you will need infront of you for a primary/service clean -
Your chosen barrel stripped from the rifle, with all hop parts removed.
1/ A cleaning rod long enough to travel the full length of the barrel being cleaned.
2/ Some lint free cloth cut into strips that fit through the end of the cleaning rod ( Iuse 'Jay' cloth)
3/ A variable or low speed drill
4/ Some low abrasive compound ( I use 'T'cut)
5/ Some Wax or Silicon base polish ( I use Auto Glym polish)
6/ Avice or clamp to hold the barrel firmly without squashing it
A picture for reference when you are wandering round Halfords/your dads garage looking for these items.....
http://i123.photobucket.com/albums/o306/vindicareassassin/Airsoft%20Weapons/1001.jpg
Once you have these items collected together you can start...
1/ Clamp the barrel firmly in the vice.
2/ Place a small amount of cutting compound on the tip of the swab in your cleaning rod, the amount will vary depending on the barrel length, but it should be enough to coat the inner of the barrel fully, and feed the rod in and out of the barrel to distribute the compound evenly.
3/ Now fit the rod into the drill, and on a low speed, feed the rod the full length of the barrel 2 or 3 times.
4/ Now replace the swab with aclean strip of cloth and repeat part 3.
5/ Repeat parts 3 and 4 a further 2 or 3 times or until the swab is coming out near clean, like this.....
http://i123.photobucket.com/albums/o306/vindicareassassin/Airsoft%20Weapons/1002.jpg
Now using a new set of cleaning swabs follow steps 1 through to 5 only this time using your chosen wax, and the job is done.
Make sure you clean all residue from the hop cut out and barrel ends with clean cloth, then you are free to re-assemble the barrel and hop and re-fit into your weapon.
From now on all you should get in the habit of doing is running a clean, dry swab down your barrel after every skirmish to keep it reasonably clean, and only doing the wax application process at every major service/overhaul.
As a side note, when you're searching on the forums, keep in mind the search function is set to by default to only look back 7 days and display 10 posts. So, if you know the post was further back than that 7 days, or there's a lot of information on the topic, broaden those search fields.