Dlask does NOT mill a bevel at the back of the mag well on his lowers, so Thermolds do NOT fit properly. Solution ... file off the plastic boss at the back of the Thermold mags ... about five minutes work each, and the mags will still work perfectly in the other brand lowers.
Originally, Dlask had SOME of their receivers powder coated, before they started in anodising. The powder coating can build up and make things tight. Anodising usually does NOT change clearances very much. Joe anodised a couple of Norinco previously painted lowers for me, and the finish turned out excellent. In fact, they match my OLYMPIC uppers almost perfectly.
Speaking of AR 15 receiver clearances, one of my OLY flat top uppers and one of my NORC lowers are WAY tighter than my Dlask upper and lower. And of the dozen or so mags I've got, only one does not drop free from my Dlask lower. These things vary, for most any brand, which is why it is always a good idea to buy a hand matched UPPER/LOWER combo when ever possible.
At least with the Dlask parts [ and even with the Norc parts too ] you can't slip a dime between the uppers and lowers, like you can with some VERY expensive Colt factory built rifles.
The main complaint I have about the Dlask AR 15 rifles are the notorious "roll pins" used to retain the front sight base to the barrel. I've never had a problem with the roll pins on my Dlasks, but they do offend my esthetic senses.
see the long thread about Roll pins elsewhere in this forum.
of course,
YMMV
[;{)
LAZ 1