-Whole rubbery Pelvic cover like- Mk.3/4/6, Rubber covered elbow jointss, Rubber collar.

-Thighs rotation is dedicated to the hips joint only.(Joint below the round flare dispenser) Where with Mk.3 you can rotate more, though Mk.4/6 much less, none with Mk.5. Because of the relatively smaller pelvic (& lacking additional thigh rotation), the hips has actually less articulation range than Mk.3/4/6.

-Abs articulation is actually more limited than Mk.4/6. Mk.4/6 can actually bend deeper and side crunch slight more. The front torso is actually compose of many individual parts that allows movement, mainly for the abs articulation. Chest armour collapsible for added arm articulation range, seen on the first Mk.3.

-Things to watchout for: Heel/Feet/hand guards are actually specific for L or R portions and in some cases you'll may have double R or L. Example: I've a L hand guard on the Right hand (though this might be seller related/isolated). This happens too on Mk. 6 and 4.... so much for better QC (if it's HT's fault).