CMMG .22LR Conversion - Windage Accuracy Issues

[james_bond_007]

SUMMARY: CMMG Evolution Conversion Kit seems to shoot 4"-6" to the right @ 50 yards

EQUIPMENT:

• CMMG Evolution .22LR Conversion kit Similar to http://www.cmmginc.com/product_p/22ba68d.htm
• Rifle: CAI .223 C15A1 A1-style AR-15 1:9RH twist http://www.centuryarms.com/manuals/p...fle/index.html
• Various .22LR bulk ammo
• Federal XM855 and M193 5.56x45 Ammo

ISSUE:
When using the open sights (A1 style) and windage zeroed at 50 and 100 yards using the 5.56 bolt, the rear sight seems fairly centered. ( I am concerned with windage, not elevation. I understand that the sights will not be zeroed in elevation at BOTH these ranges, AND that typically the rifle sights are supposed to be zeroed and 25m/300m for the A1 sights/5.56 )
With the CMMG .22 kit installed, the rifle seems to shoot about 6" to the right at 25-50 yards.

I CAN get it zeroed, but have to move the rear sight almost all the way to the left.

I do not have a scope for this, as it has an A1 non-removable handle on top.
I tried a friend's "handle mounted" scope once , but did not like the scope sitting another 2-3" above the already high handle.
I only use it for plinking and wanted the .22LR for "inexpensive" plinking.

I am not looking for PINPOINT accuracy, but believe the .22LR zero should be pretty close to the 5.56 zero, at that range, without moving the sights.

SUGGESTIONS:
It was suggested that the front sight might be incorrectly pinned. If true, I cannot, however, understand why 5.56 shoots "straight" and .22LR slides to the right, at such a short range.
It was suggested that the barrel may be misaligned.
It was suggested that I might be jerking the trigger on the 5.56 (probably not on the .22LR)
It was suggested that maybe there was more wind when firing the .22LR. I'm not buying this, as at the short distance, minor wind changes should not be this big a factor.
It was suggested that the CAI rifle is a piece of junk. I'm not expecting it to be competition-level accurate, but it seems fine for plinking.

ACTIONS:
Rifle was still under warranty, so I sent it back to CAI. They test fired it at 100 yards (with a 5.56 tracer) and returned it certifying it was zeroed at 100 yards.
I tried 5.56 again...seemed a pretty good "windage" zero.
I tried the .22 Kit again, without moving the sights, and still 6" to the right.
I tried 5.56 again (in case something got bumped etc.)...still seemed a pretty good "windage" zero.
Since MY 5.56 was on zero, I tried out the " me jerking the trigger " theory.

REQUEST:
As I said, I'm not looking for 1:1 accuracy between .22 and 5.56, but am expecting things to be close.
Am I expecting too much?
If not, any suggestions as to why the .22 Kit behaves this way ?
Anyone else have a kit? Can you comment on your experiences ?