They look pretty cool... I guess.
I've handled one, in the flesh... and before I did, I was planning on getting one. Actually handling one changed my mind though, I mean come on!! It's pro-mag... not exactly top shelf quality.
First off, I'm not sure what they use for the polymer... it feels alright, but the rigidity leaves something to be desired. The MN 91/30 barrel is pencil thin, and even with the stock barrel in place, the forend isn't rigid enough to keep the barrel floating when shooting off a bag or bipod. You would need to take away even MORE material from the barrel channel to keep the flexing forend from touching the barrel. On top of that, the rear action screw threads into a blind nut that the stock is injection molded around... there is no flange, or ribs keeping this nut inside the stock. On the one I handled, this nut started working it's way out of the stock in 3 rnds. The magazines have major issues... they came out with a fix though... take your magazine apart, force the base plate into the mag on end (spreading the walls of the mag) and bake it in the oven. Once cool, you can re-assemble it. Sounds good... but even after that, my buddies 5 rnd mag wouldn't feed the last two rounds.
In my honest opinion. there are far better aftermarket stocks available... Check out these links.
Boyds:
Richards Microfit Gunstocks
Bluegrass Stock Company
Mosin Nagant Stocks, Custom Gunstocks for your Mosin Nagant - Home
I've got a boyds on a 1932 Tula, w/ originnal barrel cut down to 26"... she's plenty accurate as long as you don't get the barrel too warm.
Here is some video shooting her...
[video=youtube;7aU-tZnxMBY]https://www.youtube.com/watch?v=7aU-tZnxMBY&feature=youtu.be[/video]
I also have a Big Gorilla stock that I'm putting on an M28/76...
These are all wood stocks... but you can paint them.
Here is a Lowel designs L96 stock for the Mosin... unfortunaly he stopped making stocks. But it's a walnut stock, and I painted it for another Mosin Nagant project I'm working on. (it is missing the cheekpiece and butt in this pic)
I will echo what Joop said above. The Mosin Nagant is plenty accurate... Here is a Mosin Nagant I built for a friend. She's wearing a Czech UK-59 barrel, and 5-shot groups at 100 yds average slightly less than 1/2 MOA.