Two different versions of the same models? - Magpul Industries MBUS Pro Flip Up Sights

I'm not sure why there are two different sets of sights in the pictures. Which ones will you receive is a big ? There are the ones with "grooved" knobs, with the standard MagPul screw, and ones with "knurled" knobs, and a Phillip's head screw. Also the flip aperture on the knurled knob rear does not flip up tight to the stationary aperture, it seems cheap. The front with the "knurled" knob does not have the O-ring between the knob and body, making the post flop around, and turn with the knob. The knurled knob version is very chinsy, I wish we could specify which ones we would receive. Show me pictures of the both versions, then send me the crappy ones...