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27 January 2008, 11:28 #4
Included in the modifications was removal of the external head screws, with those being swapped out for flat head screws which are flush with the rail. This allows for mounting of lights or other items directly over the screws. More obvious was the removal of the standard FSB, which is the design that finalized the rail. To the best of my knowledge, this was the first time that the US Military has utilized the M4/ M16 weapon system with an extended rail and folding sight.
The below pictures show the currently issued DD RIS II rail on a Colt 6721 lower (PRI sights are not issued items).

Last edited by Stickman; 31 January 2008 at 12:08.




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