I got this stock several months ago for my Modulus Stryfe, and it works awesome. It fully collapses even with the OOD small Stryfe extended battery cover. This stock is built very well, considering it only costs $20. My biggest gripe about this stock is that the sliding system is a little wobbly, but for any nerf use it won't bother anything. Also, while there is some play in the sliding part, it doesn't feel like it's going to fall off or break; you can put a lot of weight on this stock (i.e., bracing it against your shoulder to prime a heavy spring) and it will hold up fine. The actual stock attachment point (the part that attaches the stock to the blaster) is very solid. The mock buffer tube is just friction fitted, but it shouldn't come off on its own. If it bothers you, you can just use a little hot glue or something (like I did.) This stock is also very comfortable, using the mock buffer tube as a cheek rest.
Pros:
Inexpensive
VERY well built
Solid attachment point
Comfortable to shoulder
Makes your Stryfe look like a PDW
Cons:
Wobbly sliding mechanism
TL;DR--Perfect nerf stock (especially for a Stryfe), apart from the play in the sliding mechanism.
