Flawless fit and finish... with excellent accuracy/reliability - Daniel Defense DDM4 V7 S 11.5in 5.56 Complete Upper Receiver w/ Flash Hider

Paired with a Geissele super 42 braided buffer spring and h1 buffer, Wilson Combat LPK, and a Rise armament Ra434 trigger and Gen3 Pmags - 1000 plus rounds of 62gr with zero issues whatsoever, straight out of the box. Not a single misfeed, not a single jam, shells ejecting at 3 o'clock. Excellent accuracy out to 100yds (haven't shot further as of yet) using a Leupold Freedom RDS with a 1 moa red dot, zero magnification and CDS.

Liked the small mfr rail so much that I ordered another one for a smaller .300 blackout build. Just an absolutely reliable product, as expected from Daniel Defense.

*New gun builders should note that currently the provided vertical foregrip should not be installed, and only a pistol brace can be used with this upper :) Unless you're willing to do the whole tax stamp thing.