Excellent drop in fit, some minor issues
Assembly works great with the reciever and Daniel Denfense RIS i have, finish is very good and the inner barrel rests perfectly with no play and no tightness. While not really a huge issue the roll pin to hold the gas line in place is very difficult to insert, evenusing professional grade pin-punches, it might need some slight adjustment with a small diamon file to the hole, easy work. I recommend using some form of jig to lay the gas block perpendicular to the striking direction.Another issue i found to be serious if still small is that the muzzle threading has one or two degrees of misalignment with the bore. A regular flash hider will not show but a thread attaching suppressor makes the tolerance error easily visible. I did not intend my rifle to have a permanent suppressor so for me its not a problem.