Just received my G-43 slide from Battle Werx today. Mailed to them on August 8th, so just shy of one month turnaround including shipping.
Milled for a Holosun 407k and refinished in their DLC. Beautiful machining and finish. The optic fits perfectly snug, with the tiniest, barely perceptible bit of front-to-back play. Like, maybe a human hair would fill the gap.
The correct screws were in the slide and a spare set was included as well. I know they are only $2.50 a pair, but it was a nice touch. Right around $150 for the work and I couldn't be more happy with it.