LD, that stock is a BCM MOD-0 SOPMOD.

I really like LMT's SOPMOD stocks on a little bigger, more precision rifle, ditto for Magpul's STR, but the BCM is lighter, very snug on the buffer tube & gives very good cheek weld on a smaller, lighter, shorter gun & balances it very well.

And it's a lot cheaper than an LMT, if you can even find one, & quite a bit cheaper than a Magpul STR.

MM