Has anyone heard of a new LE program that Glock is doing where officers can trade in old Glocks toward the purchase of a new Gen 4? Our armorer just told me that Glock just came up with this. He was saying that you make your order, make your payment (between 150-$200 depending on model), new gun shows up, then you send the old one in. He said that all guns have night sites. Sounds like a nice program.