I was lucky enough to be able to place a custom Daniel Defense M4 order on 12/29. Received 1/22.
My build is similar to a V1. Due to a backorder on a part (delaying my build by 2-3 weeks) and fearing I wouldn't be able to receive it in 2-3 weeks due to rapidly changing laws, I changed my order a bit. My original order was closer to a V5 but is now a V1. They ran out of the mid gov't 16" barrel. I was given the option to keep the mid length gas system but change to a light weight 16" barrel (but those heat up quicker and do not perform as well at distances >200yrd) or switch to a carbine gas system and get a carbine gov't 16" barrel.
With the constraint that I wanted my rifle ASAP, and choosing between the two options, the barrel was more important to me than the little difference between the gas systems (considering it is also a DD, not a cheap rifle, not expecting any issues).
All in all:
-Carbine gas system
-16" gov't barrel
-SSA trigger
-iron sights
12" Omega X rail
comes with DD case and 1, 30rd pmag.
I love it.
(*rifle has no magazine nor round chambered while taking photos. Photos were taken when rifle was unloaded and on safe position)