Bottom metal

HS Precision may. I have the Gen 1 and it sits almost flush. Gen 2 looks like it sits a little proud below the stock line, but not like a 5 rd AI mag.
 
When I was looking for the same thing the HS precision was the closest that I found. It doesn't sit perfectly flush but it's not bad.
 
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It doesn't sit very clean, but it functions well.
This is in a Manners inletted for Rem BDL.

First one is the flush and the second it what I think comes with the Gen 2. Both hold 3 rounds.

I am thinking when I re-barrel, it will be a 300 WM as it allows me to run them at the length I have them seated in my other 300 WM. These mags are for the RUM size.
 
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