I as a user would stay away from those gun, tactics and they way we use our Rifles are different and i see no problems in our tactics..
Why i stick to Insas :
1. Field maintenance time and ease as it follows AK design
2. Less complications hence lesser moving parts again from AK design
3. High accuracy and precision from M16 type Iron sight with longer barrel
Now you search field manual of M16 and its maintenance and study cut-way pictures of AK and M16, You will get your answer..
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Old data on Insas 1B not 1B1..
The new Rifle is a 1kg lesser than previous loaded..
Lesser than galil ace and others..