FN HERSTAL PS90 50RND WITH VORTEX RED DOT 5.7X28 FN PS90® 50 rd Chambered in the 5.7x28mm cartridge, the FN PS90® utilizes blowback operation and fires from a closed bolt for greater accuracy and reliability. The FN PS90’s 16.04” cold hammer-forged MIL-SPEC barrel is equipped with... MSRP: Was: Now: $2,149.99 Out of stock