There are many ways to do it... wood screws threaded directly into the stock, machine screws through to T-nuts, etc.
I went with a small piece of aluminum billet. Tapped in three places for m4 screws.
If your gun/stock has the clearance, I recommend this method highly.
Absolutely rock solid
![](https://i.imgur.com/SmbSnSj.jpg)
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![](https://i.imgur.com/pSnRDDU.jpg)