Quoting from other thread for same purpose >>
Me hold OFB made Black AK7 back in 2007, The Rifle was issued to 9th para and i had the opportunity to take a pic with it as it was very unique rifle in those days..
This Rifle is also Unique and not same as Bulgarian One, It had Gas regulator at front over gas tube, This was not in any other AK even today..
OFB removed it later, Since then OFB made lots of modifications on this Rifle, You cannot distinguished them unless you hold them and look for the markings..
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The same Rifle is again modified and much of it now 1B1 internally, As Kalashnikov sued OFB once for copying his design, It came back as Ghatak ..
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Its not at all confusing, Give a read to this thread and post replies with respect to RFI for 7.62x51mm there
http://defenceforumindia.com/forum/threads/marine-assault-rifle-of-7-62-x-51mm-caliber-ia-rfi.76859/