Here's some materials. All will (hopefully) become clear.
This is an early pic.
I took apart my praxis stock and superglue'd those white thinwall 1/2" pvc "collars" to half of the shell of the stock. You could glue longer schedule 40 there, secured to the stock orange struts with a little different design and be done. The metal tubing I chose is both for strength and looks. I felt no need to add anything to stop flex besides what's shown. Also note that the lower piece of black square metal tubing wasn't needed for strength and was discarded to save weight. This may look overcomplicated but there's a method to my madness. I am sorry that I can't give a traditional materials list though. It's all nested together with some electrical tape on the silver tubes. I still haven't glue'd it.
Pretty much done, just a few more details to add.
Here's the way I attached it to my pump handle so it would be sturdy but I could remove everything.
That black coupler is cut from that weird 3 pronged coupler shown abover that is actually for a set of shelves. A regular pvc coupler could be used just as well. You might recognize that phillips head nut and allen bolt from the materials picture as something your furniture is put together with. Here's that nut sunk, epoxied and gooped into my pump handle.
These clips come in handy. They say "Magla". I have no idea if they sell these separately somewhere.
And the blaster this goes on. There's very little movement at all now and I'm pretty happy with it so far. Notice the way the absolvers clip on both sides, top or bottom.
So some ideas for stregthening nerf stocks, adding features and some ways to mount them. This is not strictly a write-up, just some ideas. I want you to see how to adapt materials on hand. I wouldn't mind hearing more ideas for expanding this. For instance, next up is a homemade cheeckpiece, buttplate (buttcheek. HA!) & somewhat integrated storage for a missile/arrow adapter.