Got the 507C from Holosun and my milled slide back from Defensive Creations. Very happy with the look of the plate from Chambers and the milling from DC. Hope to get it out to the range and sighted in this weekend.
As a side note, when an LFer asked via text what gun I was putting the 507C on, and I said 1911, in LF fashion he replied "Boomer Gat". So from this point forward it will be known as Boomer Gat.