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LWRC REPR MKII upper receiver rod compatibility

May I ask what you are trying to do ? I don't mean that in a a-hole way, just more of a "I don't think I would want to mess with a REPR upper drastically.

I "think" it might fit... you might consider e-mailing MI and ask them

That said, I would "think" a MI receiver rod would work. From what I can tell...Your REPR upper appears to use a typical 308 CH track dimension-ally, appears to be typical 308 bolt lug setup, and a typical bolt to receiver extension interface.

Be aware... you might need to remove some material on the MI's top "fin", if it is a tight fit.

223 Ackley Improved

I had similar performance and issues with the 75ELDMs and H4895. I was running 25.7gn of H4895 and got about 3106fps out of a 26” barrel 1:7 twist. Getting .7-1moa groups.

My half baked theory was that the plastic tip was deforming with that sort of heat and pressure and impacting ballistic performance. It’s the only round I had real issues with in the 223AI. It might be worth backing it off a little bit and seeing if that helps.
I bought some Hornady 75gn BTHP’s to try soon.