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I think I've determined that the original stock on my M&P 15 is an AR-Stoner M4 stock (specifically an AR-Stoner M4 6-Position Mil-Spec Diameter Collapsible AR-15 Carbine Synthetic Black). At least that's the only one I've found that matches it visually.

I recently purchased an M&P 15 Sport II and really like it, but want to add some additional padding to the stock. I've found several pads from Magpul, Limbsaver and others. However, they always state compatibility as "will fit CTS mil-spec" or "ACS-L", etc. I have no idea what a lot of that alphabet soup means, so I don't know if the pad I'm looking at will fit my rifle or not. I can't find any specs about the stock that came on the rifle other than "6-position collapsible stock." I think it's mil-spec, but don't know anything beyond that - ACS, CTR, UBR, ABC, 123, whatever.

Does anyone know exactly what type of stock comes on the M&P 15 Sport II?

Any recommendations on a pad to add to it? I wouldn't mind it being an inch or so thicker; the stock seems a little short even when fully extended.