Click here to see details of the FBI’s requirements and what makes the Gen5 Glock different. This proves Glock is willing to change its design to meet customer demands. I also think it’s interesting that there will be three versions of the Glock 17/19 with Gen3-Gen5. I’m still a fan of the Gen3 because the Gen4 grip surface is not comfortable to me, and I like the finger grooves on the grip. Maybe I’ll change my mind once I get to hold a Gen5.