just received mine, .223 in 13.9".
overall looks pretty solid made, exterior is clean, the brake is overclocked off vertical by about 10-15 deg, which is quite annoying for a $1200 upper, and no way to fix that, as it is factory pinned. no biggie, but, annoying.
it arrived oiled, but racking the bolt feel a little bit grindy. i took it apart, wiped, applied proper ar lube, now it seems to be a bit better but i feel it will take some time to break it in.
will see. quite a neat design overall.
ps. it just screams 'i want a can'. pity.