Okay...It's Friday and time for a gun thread. Yesterday at the local gun and toy store in (believe or not, Maryland, I got to handle the FN Herstal PS90, the civilian semi-automatic version of the P90.This bull-pup 5.7x28 mm has been around for the LEo and Military markets for a few years. I always thought it strange looking but technically very interesting. A closed breech blow-back design, it has a unique horizontal top mounted magazine; 30 or 50 rds. Ambidextrous mag releases make it surprising fast to swap out mags. It ejects spent casings from the bottom.The strange looking stock...