My observations on the MCIWS:
1> Front and rear flip up iron sights. So it seems that IA is now serious about optics on regular issue infantry AR
2> This reflex sight seem to be the same one mounted on the Milap/MSMC. Is this a Meprolight?
3> P-rails finally on 3, 6, 9 & 12 o'clock. Maybe the 12 o'clock rail should have been longer so that a 2/4x magnifier could be attached to the reflex sight?
4> M16 type cocking handle. Ambidextrous, but every time one reloads a mag, the weapon would have to be dismounted from the shoulder to operate it. Also, forward assist is missing. What happens in case of a soft let down of the bolt?
5> Basic cheek rest is ok for standard issue. But in case of larger (higher profile) optics like thermal or one with a laser rangefinder, it would be hard to align sight with eye in the absence of an adjustable cheek rest
6> Telescopic butt stock. How many positions are there? I guess this is not for CQB, else would have been a foldable butt stock (CQB/PDW task delegated to the MSMC?)
7> Only 2 sling points. Maybe a third sling point on the sides would have helped?
8> Bayonet lugs are the same as INSAS 1B1
9> Looks like a good hollow and textured ergonomic pistol grip, with place for a tool kit/cleaning kit inside
10> I would say that it has a gas operated short stroke self regulated action. Doesn't seem to have any gas adjusting mechanism. Definitely a floating barrel design
11> Polymer foregrip, which could be detached by taking out the front take-down pin (12) to reveal the full 6 o'clock P-rail to mount the UBGL
12> Front take-down pin to attach polymer foregrip, UBGL, or to disassemble the upper and lower receivers
13> Closed rotating bolt action. Ejection is not ambidextrous. No forward eject
14> Mag window. More clarity to the soldier to know how many rounds still left in the mounted mag
15> AR-15 style ambidextrous mag release
16> I think they might have placed the bolt release in front of the trigger, inside the trigger cavity, to be operated by the trigger finger, like in the ARX-160. Else, the trigger could be dual action where after cocking, the first short trigger pull releases the bolt
17> Ambidextrous fire selector lever. Standard Safe/Single/Burst modes
18> Rear take-down pin to disassemble the upper and lower receivers
19> Not exactly sure what it is. Most probably just the rivet pin for the hammer. Might also be the bolt release button.
20> Not sure what this polymer piece with 2 allen head screws is for. Maybe just to take off the upper polymer cover.
The receivers are not made out of stamped sheet metal like the AK or INSAS. This looks more like made out of cast lightweight alloy. So, it would be much more expensive than the INSAS and would not be produced as quickly as the INSAS. It would be lighter than the INSAS, but not as light as a gun with a full polymer body like the ARX-160. The metal crafting seems to be immaculate and impressive.
Thanks to
@sob for allowing me to edit his picture.