What is the width measurement of the enhanced drop in quad rail? Mid length if there is a difference.

Thanks

2.2 inch Wide x 2.4 inch High ... that's the older-style, not the Enhanced. They are most likely the same widths. The MRF's are just a hair thinner.
They lock in tight. I've had no problems with two of the older style, mid-length drop-ins, or two 11" Bravo's, or a 10" MRF or a 13" VTAC Alpha.

I'm just going to leave out my opinion of the past, piss-poor personnel hire of a dimwit