Well, I just got back from the range and have what seems like major issues w/ my sights:

I traded my way into a flat-top upper (dpms 16" w/ A2 bird cage 1x9).  With some C-mas money I bought an ARMS #40L rear and a YHM rail mounted front flip-up buis's.

*I think* that I mounted everything correctly.  I also bought a RRA combo b,c,ch to complete the set-up.  That should be sufficient info for my help.

Here is what happened:

I set out a target at ~50yds and had also set out some bowling pins around 20-25yds away.
I figured since the range was packed (outdoor) I would see if I was close to 'on paper' by firing at a pin.  After 3-5 rds and no hits at 25yds I finally saw dirt/grass fly about 2.5' (feet-high) above the pin.

I continued shooting thru-out the time there and came to the conclusion that after maxing out the elevation on my front sight that at ~100yds my rifle was shooting at least 4-5' (feet not a mistake)high.

On the way out the pistol bay opened up so I tooks some rounds and shot from 10yds and shot a 3rd off hand group about 3"(inches) high  and then proceeded to shoot another 3rd group another 3" higher at 15yds.

I also maxed out my elevation the other way (down) just to be sure and then shot approx. 16" high at 15yds--this proved that I was making elevation adjustments the correct way.

What to do???

Again I say, "HELP!"

I have been thinking about one aspect:

At one time I was intersted in Cetme's and remember people experiencing a pretty drastic poi shift when they took off the orig. flash hider and replaced it w/ another.

Anyone had this experience w/ the AR and going from A2 bird cage to a YHM 5C2?

It's possible you need a taller front sight post.  That would explain why the bullets are hitting too high.  Some people have found they need this when installing an ARMS #40.

You can get one through Bushmaster.

Thanks El roto and a couple of others for replying.

I figured out what mistake I have made--maybe this will help others:

I bought the one on the left, needed to buy the one on the right--that simple!