I hate to be that guy who recommends something completely opposite what you are looking for. But, in this case, I will.
Check out D. Wilson Mfg
He does excellent work. I had a pin and weld job done and it was perfect and probably less than 2 weeks turnaround...
I don't use them exclusively. Half of mine have them, half don't.
Ones I've built that I used a dimple jig on have all been fine with Rocksett.
If I had the ability to taper pin them, I would do that though.
You wouldn't be able to run it in SSP cause it's single action only. ESP and CDP are fine. If you run it in ESP you will be at a disadvantage cause you're going up against people running 10+1 rounds. With CDP you will be 8+1.
From what I remember, and I haven't looked at the IDPA equipment appendices in a while, is that you wouldn't be able to run it in SSP.
It should be good for ESP and CDP as long as it meets the weight requirements and fits in the box.
I'm not much of a Curio and Relic kinda guy. But, I have to say, I truly enjoy your posts. The amount of research you must put into a purchase is incredible.
What would the Marines be using these for? Pistol teams or training?