4-6 foot penetration into bone and flesh from a 9mm +p?
Crushing is so much more graphically entertaining than slipping and sliding but call me very skeptical.
yes, the description’s 4-6 feet seems optimistic...
But for the reference: NATO spec. 9mm 124 FMJ can penetrate in excess of 32 inches of calibrated ordnance gelatin as a “general rule”.
P.S. as further reference, for extrapolation...:
9mm 115 FMJ penetrates about 24 in of calibrated ordnance gelatin