...I believe DW factory mags are Metalforms.
Eh, I think you are right in this case, got my "M" Companies mixed up. Never had any luck with either one of them.
DW has definitely used Checkmate more recentely.
Not sure if they are still using Checkmate.
If it were my pistol, I would seek out Checkmates with welded bases, hybrid lips and dimpled checkmate followers. Out of the 3 posted the Wilson is the closest.
FWIW Keith (KeithDW) has re appeared on 1911forum... So he is still there at DW.