Increasing P30SK/VP9SK mag capacity - Mod found
For kicks, I took apart a 12rd Sig P365 mag and put the guts into a P30SK/VP9SK 10rd mag and was able to load 12rds into it. I took it to the range and put about 40 RDS thought it with no issues and the slide locked back every time. I wasn't able to use the HK follower because of the narrow 365 spring but I bet you could do some filing and make it work if you wanted to. Anyway, not sure I'd trust my life to it but there's potential if HK would learn from the 365.