One of the first batch 20 rounders that came with mine had cracked after 6 months of leaving it loaded and I got a replacement from CZ. One of my 30 rounders, I had left loaded for over a year and it started to crack and I got that replaced. I have shot my Scorpion many times since it first came to market and I welcome new things. So far, the only problem with the Manticore mags is it reacts differently to certain ammo like UMC that caused 2 double feeds in a roll and the bolt not locking back on empty. Other than those, they work well enough
They're nice for the extra rounds, but there have been reports that some won't activate the LRBHO. Mine does. My factory mags work good too. I say have both.
In the case of not locking bolt home for me, I just work it like an MP5 and lock the charging handle up to open the bolt and then slap it down when reloading