Thanks for sending the pm and posting the responses Mr. Steve. It is always best to try to get answers straight from the horses' mouths whenever possible.
Just to clarify a bit on some background for our members who might be wondering. Mr. Angus is the Captain of the CZ USA Shooting team and an excellent CZ smith. Mr. Matt is another member of the same team, and an excellent CZ smith as well. So you have two folks who have a very strong, hands on working and shooting experience with various CZ pistols responding to this issue.
When I have been on that site I often see where various members have fired 10, 20, 30, or 40 + Ks of rounds through their 75Bs without any parts failures at all. Sometimes I will read where a slide stop broke and had to be replaced. It appears to be common that many high volume shooters there, many who are competitive shooters as well, do tend to replace springs at some point as preventative maintenance.
When I had the pleasure of finally meeting Mr. Angusm to pick up my 75B he had worked his magic on and to purchase the SP-01 he had done the same to for me, the timing was such that I was able to pick up a new slide stop for a buddy of mine. I also discussed the issue of what pound springs he would suggest being installed into a used CZ75B. I was a bit surprised when Mr. Angus suggested using a lighter poundage spring, rather than going with a heavier one. He stated he always did this in his comp pistols, and to date with all the rounds fired through various pistols, he had yet to have a slide stop break. I followed his suggestion and got the suggested spring to send my buddy for his pistol, along with the slide stop he needed.
I also know from dealing with him that emails from Mr. Angus tend to be on the short side, as he is a typist using one finger of each hand, lol. Obviously he is a much more accomplished shooter and smith than a typist.
Mr. Gib, obviously I am not Mr. Chris, but I can answer your question for you sir. The mag is the 18 round mag that comes with the SP-01 in 9mm. That is the factory mag, and is what came with my newly purchased SP-01. They work fine, but since I might carry my SP-01 concealed at times too, I have also confirmed that the Mec-Gar 75B 16 rd 9mm mags work just fine in the SP-01 as well. Hope that helps. Yell if I can help further on that issue sir.
I am certainly not a Mr. Angus, Mr. Matt, or Mr. Steve, and will never try to claim to be. But in the short time I have been shaking hands with the CZ pistols, I have become more and more impressed with them. Most folks posting comments about their pistols on that forum do nothing short of rave over the accuracy, performance and durability of their weapons. More and more I am having to agree with those comments.
I fired my SP-01 and my 75B in 40 both quite a bit this past Saturday with my shooting buddy, Mr. John, out in the desert. I probably fired 400 more rounds through the SP-01 as part of its break-in. It was both boringly accurate and reliable, with no problems at all.
I managed to put another 73 rounds throught the 75B 40, wanting to see what kind of group I could get from 6 mags after working the SP-01 out. I would have fired more, but I did not want to have to draw down on Mr. John to get my 40 cal from him, lol. I was shooting from about 10 yards, standing two hand hold, and ended up with a group that would probably be covered with a silver dollar. I was impressed with myself, and even more impressed with the accuracy the 75B 40 gives me too. I sometimes have read folks commenting that the 40 round is just not inherently accurate. This pistol might change their mind, but to be honest I have never experienced an accuracy issue with any 40 cal pistol I have fired.
Personally I think these CZ pistols are built like a tank, and will give me more rounds down range than I may be able to put through them when all is said and done. Just my thoughts, but I am glad to hear that they are largely consistent with the folks I feel do know things - Mr. Angus, Mr. Matt, and Mr. Steve.