So I now have 2 colt 6920's. I'm wanting 1 of 2 rails. Either the daniel defence lite fsp 12 inch or the daniel defence ris 2 12 inch fsp. They appear slightly dimensionally diferent. After many hours looking the only other difference I can find is with the ris 2 the bottom rail comes of for mounting a m203. While I wont be getting a m203 it would be nice for cleaning purposes. So does anyone have any info? Preferences? Pics of either of these specific rail? Anything I missed? I know the omega x is slightly cheaper and while I have seen the DD torture vid I'm just not real thriller with the idea of set screws so its hardly an option for me.