The points you raised are already talked to death on this thread and its former once, but i will still repeat them.
1. OFB only assemble the parts made by private sectors which are selected through L1 bidding system.
2. Why need for full auto when we have LMG for suppressive fire.
3. 1B1 dust cover is thicker and its joined with rest of the rifle unlike AK, zeroing was never an issue, their is rail for optics on rifle and P-rails can be used on it as well.
4. Its fiber body is strongest compare all other firearm in service, we never had upper part removed and the units which remove them is for sake of ease in field maintenance.
5. Barrel is better than most other including Israeli once in service, Refer to point no 2.
6. Not true, Its the other way around :
http://i.imgur.com/btJdIIJ.jpg
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I have covered most of the misunderstood points and disinformation in this thread and other two thread before this one.