Just wondering cus I've made 6 accounts all to get ksg shotgun and haven't gotten it yet :/ ...
How it works for Z8Games (not just black marcket): Poor account = better chances; Best account = more challenging. Tough, it's dynamic, so it doesn't apply all the time.
Expanding the comment above, there are some days on the week where chances are bigger (monday, wednesday and saturday, -or- tuesday, thursday and sunday, are the usual patterns, but this is dynamic too, and sometimes friday gets included), even more in some specific hours (morning 9:00-11:00 and evening 17:00-19:00 is the time for GMT-03:00 timezone) after a certain number of minutes since the last winner on the BM (1-3 minutes), specially for those crates which are not getting won by some people (2-3+ persons in a row means not to buy/spin) or that doesn't try to make you desire to win (e.g.: if the permanent weapon appears upside or downside on a non-winning spot, that's a sign to stop buying/spinning).
I'm not sure how it works, but in terms of statistics, your chance of getting ksg shotgun could be 1% out of 100% or less, that means you need to atleast spin 100 times before getting one. This was just an example.