I posted this in a different thread but I figured it would be good as its own thread. I won't be the only one needing help.
My Magpul stuff tried so far:
1. Mid length handguard
2. MOE Plus grip
3. ACS stock in Mil-Spec

Now here's the issues with this setup:
1. Handguard heat shield needs alteration. you have to widen it to fit around the barrel or it will scratch it.

2. MOE Plus grip does not work, as the takedown detent spring will sit directly over the rubber part of the MOE Plus grip.

3. My ACS-L stock would not lock down completely/tightly on the buffer tube.

Solutions:
1. Kept the foregrip and it's awesome, very tight.

2. Sent pistol grip back and Purchased MIAD grip and MIAD grip wedge. There is a gap between any magpul grip you buy and the lower receiver (the beavertail section). MIAD works better, have not received wedge to ensure the spring location is perfect. right now without wedge installed the spring looks like it has a small chance to slip out.

3. Sent the stock back and have not replaced yet. I need help on this one myself.

Update: Got the magpul wedge today. Had to alter it a lot to get the thing to fit. Turns out that the wedge is not an easy fit for the MIAD plus the lower receiver size on these rifles. The space between the beavertail and the receiver is much thinner than the wedge was made for, in addition to the metal rib that the grip is screwed into is longer at its base and you have to cut out that section of the wedge so it will fit on easily.

Thanks for taking the time to write this up.

You are welcome Drag, my pleasure. I should post some pics of this thing -

Here is an update: Received a Magpul STR stock, and it is perfect feel for me on this rifle. This one locks up much better than the ACS-l did. I think it was probably a fluke, as my last ACS-l worked well.

The takedown detent spring seems to be in great location and secure after the grip wedge was installed. I have not done a day at te range yet to shake things up and test it out, though.

I did scratch my barrel a bit with the magpul hand guard and it doesn't fit in the delta ring properly. I have some magpul rails on the bottom of the stock hand guard now for a vertical hand grip and because i modified the magpul hand guard it's going in the garbage. next month it will get a freefloat tube.

I've seen a few pics with the magpul handguard on a S&P 10. They LOOK like they were fitting ok. I've also seen a couple of pics where it looked a bit cocked. I had trouble with a rifle length one on a AR-15. It was a VERY tight fit in the delta ring, but it worked.