I have a CP99 and I use one of those 7 mag quick reloaders, and I've never had any bother with the gun, in fact I think it's a brilliant wee pistol, accurate, and reliable, I drop a blob of oil with one of those needle type oilers on the co2 piercer roughly after every third co2 bulb and just a drop of oil on the moving parts about once a month, I also do the same for my Alecto, and that shoots a treat as well.
I bought another co2 bulb mag the other day, so I can swap mags when blasting at ally cans and the co2 starts to cool down too much. I did have the silencer on the CP, but I've found that she balances far better without it, and accuracy is much improved. Now if I can only get rid of old mans' shake!