This is a Glock 19 9mm, Gen 4, with the a special Battleworn United State Flag Theme cerakote. These Special Edition Glocks all have a special serial number starting with "17US" (17 signifying the "17" in 1776 and US for the United States) and come equipped with upgraded sights (Ameriglo Red Fiber Front Sight, Black Pro Style Rear Sights).
This Glocks are a special run in which only 3,000 have been produced, there is no word as to whether or not more are scheduled to be produced. Either way you cut it these are a bargain!
To Do This Yourself It would cost a minimum of $800!
Regurlar MAP Pricing on Model 19 Gen4 - $539 (Minimum Price Glock Allows Dealers To Advertise New model 19Gen4 Firearms)
Special US Theme Cerakote Finishing - $210 (price based on average custom cerakote pricing of $70 per color)
Upgraded Sights - $75 (price based on $50 sights plus $25 install)