Looking to buy an HK VP9SK...question about the firing pin block. (x-post from /r/guns)

I can't seem to find any information in videos or pictures about the firing pin safety in the VP9SK. It appears to be a rotating block instead of the standard springloaded deadbolt pin style. I was wondering if anyone with a VP9SK could comment on how robust the firing pin block is compared to the traditional style. Is it an upgrade vs the older style? Sidegrade? Downgrade? Thanks. via /r/CCW http://ift.tt/2GlF1Cz