in the beginning I got parts direct from Zbroia,, then Joe got in the game,, I had a real bad experience with HIM and have not and will NOT deal with him again on anything,
my older (at least 5 yrs) original Kozak had mag advance issues that we, Zbroia and I as the technician/mechanic fixed, now it is just o-rings that need replaced, normal use so to speak,,, the sapsan is another topic, that is what I got from joe is the first sapsans on the market,,, they had multiple issues, most fixed by the sapsan 'S' model that I now have and bought used here in the classifieds
have not contacted Zbroia since 2019/2020
the parts I did get from Zbroia for warrenty repairs were shipped to me free of any cost back then
my Kozie is leaking again, I will have to unscrew the airtube, no tools needed and put it under water to see the tiny bubbles, I expect it to be the weep hole which is the outer o-ring on the reg, or a poppet leak which I will just re-sand to smooth, could use a new poppet for the older girl, she is my daily shooter