Bought one out of curiosity just to see for myself after waiting for two years to get it released. Some original skepticism and concerns aside...
Initial impressions - absolutely great! Perfect machining, finish, anodizing, and dry lube inside.
Overall design, in my opinion is a step or two ahead of a mil-spec upper. For some reason it feels lot more streamlined and compact around a brass deflector and a forward assist.
Haven't assembled it into the complete yet, but barrel extension seems to be ultra tight - much, much, tighter than a standard BCM upper and definitely will require some heat to install.
Area around the port cover door is very thick, so is the area just below a barrel nut threads. Geissele rails with lower anti-rotation tabs (MK13/14) won't fit out of the box and will require tabs to be filled off approximately 1.5-2mm on each side. Rails like Centurion might or might not fit, as the area just above barrel nut (and below the area where BCM MCMR anti-rotational tabs install) also appear slightly thicker than a mil-spec. For the reference see post #129 for BCM rail tabs location:
https://www.m4carbine.net/showthread...41#post2783841
If you're not planning to move a handguard around it's probably worthwhile to file tabs to size.
Fit to lower (again try fit for testing) - feels to have less slop than a regular BCM upper (good improvement), but not medium-tight like some Aero uppers. No concerns regarding a fit.
It feels like a solid product. No concerns with aesthetics. After some initial concerns about a rail fitment, I think it's a winning product and see no reason to buy other higher priced mil-spec uppers like a regular BCM, COLT, LMT, DD over this.
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