1. Make sure your lower receiver has never been used in a rifle barreled action with a stock on it. Meaning a stripped lower does not have to be marked pistol, however should you decide you want to have it engraved, go ahead.
2. If you use a receiver extension/buffer tube other than a pistol tube make sure you cannot affix a stock to it. Fill in the slot/holes with epoxy or JB Weld. I read someone even plastic-dipped it like you would with tools. Great idea. Cover with a foam cover if you don't want it baking in the hot sun against your face. It does not need to be permanently attached.
3. I'd strongly consider having your lower built up before ever having a <16" Upper at your house. This removes the "constructive intent" of making an unregistered SBR because you didn't have a pistol lower ready to receive a pistol upper.
I used a commercial RE on my AR pistol and I filled the position holes with epoxy and covered over it with electrical tape. I then added a foam cover to it because it was black and was sure my face would be very uncomfortable during the summer months I was out to the range. Why did I use a commercial diameter RE? Because all the stocks at my house are milspec, and none of them will fit anyway.
30 caliber junkie.
God Bless America.
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