SingleMalt

I have one, unused. I can send it for $60, which I believe would be about a wash for the price/tax/shipping.

True, but they've worked well for my guns wrt loading ease. You also need to make sure you have an appropriately sized follower because of the latch length.

Briley has done a couple for me.

Go with the factory 2-piece? https://www.midwestgunworks.com/page/mgwi/prod/60488

This?: I have one, I don't recommend it. It looks mean as hell, but it's just heavy and doesn't do much in the way of braking.

x2, he's been good about answering my questions.

Honestly I don't recall, I think I took them off my M3 - C-stock model.

I'll take the IWC mount.

That's what I put on my M3, it looks like the same stock. It didn't need the full hole cut in the pad, just a little material removed.

@Doge guided me to the M2's 2-piece latch, which I think helped a lot. https://www.midwestgunworks.com/page/mgwi/prod/60488 You'll also need a follower with a "flatter" face, I think the OE one will interfere.

I'm confused, if his barrel weren't seated, wouldn't the cap engage prematurely? It wouldn't bottom out and leave a gap. It's like the magazine, or the extension, isn't fully attached.

I've ordered several things from him, all of them arrived quickly.

PM'd

The 11703 I just got was the exact same story. Reasonable heat resulted in a little movement, lots of heat and it would start to turn and then bind up. Eventually came off and the threads looked like a candy apple.

FWIW, My late September order is supposed to be shipped late January-ish.