I've read through a bunch of threads already but can't seem to find a comparison im looking for. The Red Snake nExt gen LA bottom metal uses the 3.715 AICS mags but limits COAL to 3.5 due to action opening length. Every other bottom metal manufacturer uses the 3.56 AICS, which limits COAL to 3.480. Is this right? The effort of going the longer mags and potential hangup issues with the Red Snake metal only gains you 0.020"? Some people mention notching the receiver, does that allow longer than 3.5? Am I missing something?