The main reason I would buy this stock, is because the stock that comes with the VSR is shit. With high powered upgrades, even if done right, it will feel as if the gun is going to explode in your hands. A good example is what happened to Livonia's gun, it basically exploded.
I've heard that this stock is as close as to the real thing you're going to get, and even with a nice spread of upgrades, plus a clone gun that you can throw into this chassis, it will cost you about the price of an upgraded M24 of APS, so really it is a good price, especially for what you're getting.