Originally Posted by
minuteman1636
It is the same quad-rail that was used on the CR6920-EC 14.5" P/W carbines that were released recently. It is an Arms Unlimited exclusive upper receiver conversion kit currently. I don't have an explanation as to why Colt designated it "6930". The rail is a Colt proprietary product.
Additionally, to address another question in the discussion, these upper receivers are not take-offs or otherwise related to the European CR6920-EC or CR6920-EC 14.5" P/W carbine releases.
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