Well, that's the one for the M249 (SAW). Fits the rail fine. If you don't like the angle you can turn it around. It's solid and big, what's not to like. They run $20 (used) at fun shows.
They don't look like they would be comfortable, but they are, they REALLY are.
Not sure why that is, but the design is great, very hand filling.
I remember I bought a Tapco stock for an SKS barreled action I bought relatively cheap, and when the stock showed up I was like: "This pistol grip looks like it's going to be exceedingly uncomfortable"
I didn't know it at the time, but it was an exact copy of the M249 SAW pistol grip, and quite frankly I love it to pieces. Fantastic as a Vertical forward grip. Had one on my AR before I changed to the magpul AFG.