Most crane stocks won't slide in all the way due to the wiring in the stock itself and the connector inside the buffer tube. There's ways around it, but you've gotta get a bit more ingenious and figure out what works best for you to solve that.
Anyways, like I said, I took mine apart to see what I was up against, then I put it back together and got a drill bit and drilled through the back of the buffer tube through the adapter and all just below the threaded hole inside the buffer tube. It's a bit harder then it sounds because a drill bit that long tends to liek to wander a bit, so the trick is to keep it tight to the wall of the buffer tube as you drill so it doesn't wander into the threaded hole making you screw up the threads.
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