Hi mate, the best ones by far for this gun are h+n spezial rund kugeln....i've spelt it as on the tin so you can do a search.....these are copper coated precision lead ball, and make all the difference....I bought mine whilst working in germany, but if you check my BBS post history, there is a link to a blinding german site who specialise in these guns...every part is available!.....If you go on the german auction site everyone knows, there are dozens of sellers....just search for DDR...in Schützensport...I have not had to buy any yet over here, so I will do a deal with you....give us your address via P.M....I will send you a tin of 200 veb springstoffwerk 4.4's F.O.C. to get you going..and when you find a U.K. source, let me know where it is....also check flikr user edbeartwo to see my 310...I think they are a great bit of kit!