After all the reviews I read about these things being rock solid, I hope mine are lemons and that this isn't the standard. I picked up the standard TROY front and rear BUIS and have attached them to my upper. Unfortunately, although they very audibly click into place when put in the "up" position, they have front-back play (particularly on the front sight). The front especially concerns me because if I wiggle it around, the sight doesn't necessarily settle in the place where it would if I manually push it all the way forward. So, how tight should these be? Is any wiggle indicative of a problem, or is it a matter of how much wiggle? I was expecting these to feel like fixed sights once "locked" up and am a bit disappointed. Is there any adjustment required that I'm not aware of? Thanks in advance for any help.