The KW M700 aready comes with a semi tightbore, 6.05mm, and you won't see a huge difference if you go to something smaller, just make sure you dry swab the barrel every 20 shots or they will start to open up the groupings. Gas is somewhat inconsistant, but the gun itself is quite accurate in stock form.
Try sanding the bolt to get the black finish off. It'll turn grey, then you can polish it if you like, but it'll scratch and dull with use.
Last edited by CDN_Stalker; July 13th, 2010 at 08:53..