Glock won't let the u.s. have their guns do to production rights issues. What it all comes down to is money. The U.S. would be able to change anything they wanted to about the gun and Glock would have none of it. Too many other countries knocking on their doors to waste time kissing U.S. butt.
Do you have a reference as to where you got that information from?
Know the status of your weapon
Keep your muzzle oriented so that no one will be hurt if the firearm discharges
Keep your finger off the trigger until you have an adequate sight picture
Maintain situational awareness