The link you sent me was great thanks!

Ive got this

http://www.ebay.co.uk/itm/2904895793...ht_2267wt_1144

I hope thats ok.

Would it be wise to use gunk and 2500 grit sandpaper on the piston and the barrel inside?

I did try and use the guide in the fastford mag but its not in detail enough i find.