First, I love this stock. For the money its a no brainer. It is very light and built very well. The only thing I saw that could be made better are the plastic ears for the fork lever, I show that below. This was an alternate to the Ace Skelton stock I wanted and saved me a bunch of my by keeping my buffer tube, spring and buffer as is. So the point of this is for those stuck behind enemy lines. I couldn't find anyone's instructions on how to Massify this stock, pin it. It ended up being super easy, easier than the magpul stock. All you need is a 1/16th allen wrench.
Step 1 - Adjust the stock and mark the tube so you know where you want it.
Step 2 - Remove the stock from the buffer tube
Step 3 - Use a 1/16th allen wrench from the hole in the top of the stock to loosen set screw.
This will allow you to slide the pin out of the plunger, so that the fork lever doesn't have anything to depress on, no adjustment.
Step 4 - Slide the pin out of the plunger
Step 5 - Tighten the set screw back down, or remove and save with the pin for re-install if needed.
Step 6 - Use the allen wrench to pull down on the plunger, in the hole where the pin was, so you can slide the stock back into position.
Done!
Notes - The ears that the fork pivot on are plastic. My first attempt was to remove just the fork with a flathead screwdriver. This was easy but you still had the pin in the plunger that you could pull down on and probably wouldn't past muster.
