I went with a Gen 4 Glock a few months ago. LE pricing at that time was $399 for the gun and three mags. Night sights was a $75 upcharge. The price you report on the one you are looking at sounds fair if the gun is in good or better condition.
There is in life perhaps one fleeting moment when the courage, dedication and resolve of one man gambling against all odds will alter the destiny of nations.