Doesnt seem so bad. All 3 sound fairly easily fixed to use the AW IMUNS. Might pick one up if I ever get a clip on in the future before all this is no longer made.Having just gone through this:
1. The AW imuns extends too far into the chassis and blocks the use of the small forwardmost skin screw by about 1/4”-1/8”(not really an issue and easy fix if you cut some clearance)
2. The AW imuns is not tapped for QD cups
3. This seems to be back and forth, but a factory AI barrel is not free floated in an AT with the AW imuns because the top piece of the IMUNS ends up clamping down onto the barrel. I had some 2mm spacers 3d printed to fit the form of the IMUNS and no longer have this issue.