MPA BA comp vs BA LE chassis

I too was wondering about the MPA chassis. I looked at them years ago then went a different route. Precision Rifle blog has shown that the MPA chassis are one of the most popular set in the PRS field. True untrue I do not know. That is why I am asking. Also curious about the different chassis.
 
From my understanding, the BA ESR is the most ‘current’ version of the BA chassis with the longer forend and mlok attachment points instead of the proprietary attachment system of the original BA comp.