I'm ordering a ba tomorrow from vudoo but have been having trouble deciding between mpa's comp and a mdt acc. I pretty much set on the mpa due to the adjustable mag catch but I seen they also have the esr which is 2" longer on the forearm. The esr seems to be .4 lb's heavier but has updated mlock like the matrix. Actually surprised the comp hasn't been updated to mlock. I've only seen one pic of the mpa esr and the rest are the comp version. Am I missing why everyone goes with the comp version? I'll be going with a 22" mtu and would like to get by with no weights to balance but that doesn't seem possible.