I've had good use from both Gen 1 and Gen 2 PTS sights. One is marked such the other isn't.

Your results may vary.

Why do you need or want back up sights? What optic you using?

I'm currently using a R4700 sight on a R6500 gun. (that being said I have also used a R600 and a R1200 sight on it without issues)

I also use a PTS MOE stock because ITAR prevents me getting the real deal without, again, forking out thousands. I have no issue with the PTS stocks. There is no need for the full price of Magpul gear. PTS is for Practice Training and Simulation, that's pretty muc the definition of the 15-22......

TYSTYX That's true of any forum. I have yet to see one where people use the search function.