I've been looking at RDB's and think that maybe I might want an RDB but I read around and and find things like to quote Texcl2
" The M4a1 platform is both more accurate and reliable than the RDB. Weak points in its design need to be refined, the extractor pin must be fixed, the adjustable gas system is a poor design, the recoil spring system is weak, the controls are poorly laid out, the magazine catch is a poor design / magazine sensitive and QC is lacking."
And now they are using a car antenna for a barrel? Are the known issues being correceted in 2017 or are they exacerbating new ones?