The TRIBUS is next iteration of the previous AR-ECN&EEP. Its features include two addition QD mounting points added to the left & right side of the extended end plate. Totaling in 3 QD mounting points. The extended end plate's QD mounts are pushed back away from the webbing of the primary hand, allowing for better weapon manipulations in tight spaced and under stress without the startling pain that can result from a pinched hand when using a sling attached to a standard, flat QD end plate. Another big improvement is the added anti-rotation castle nut feature. Once installed, use the set screw to prevent the castle nut from backing out during weapon usage.