Charlie's brings you a limited production Daniel Defense upper receiver group, featuring the 9.5" free floating M4 FSP Rail System. This is NOS, or "new old stock" rail. The rails come to us in new condition, factory Daniel Defense boxes. As best we can tell, the rail system dates back to around 2005 (+/-) and, in its time, was very limited production. The rail is similar to the DDMk18 FSP, but is not the RIS-II rail, but rather a screw-on RAS style rail. We have paired the rail with a mil-spec upper receiver and Colt 10.3" Crane Mk18 Mod 1 barrel. This setup is a variation on the Mk18 Mod 1 with FSP or front sight post, but is not the same rail that many know as the DD Mk18 FSP, but is a great looking piece of nostalgia with a super-rare rail.
Charlie's, working with Potomac Armory has produced only three (3) of these. After we sell out, there will be no more unless DD re-introduces this rail, which is not likely.
We do not know which units fielded this modified Mk18, or perhaps was a prototype that never got launched. During the big build-up of the Global War on Terror in the early 2000s, many variations of different weapons were prototyped, or used for one-off missions for special forces.