Thoughts/guidance/opinions on AR pistol

[Doc45]

**Update** Got to shoot another build yesterday thanks to Mason. It was lots of fun but now with the changes from ATF on the brace I'm rethinking about just going the sbr route on my 6920 through a trust. Obviously I couldn't keep it locked & loaded in the truck but, as Clint Smith so eloquently put it, I'd use my pistol to fight to get to the rifle lol.

So lately I've been thinking about how much more practical an AR pistol would be over my 6920. Here are my ideas:
A. Buy a pistol lower, take the Colt upper and get a short barrel for it, put it on the pistol lower or
B. Sell the Colt, keep the buis (ARMS) and Eotech XPS2, sell the carbine in original configuration and buy a pistol, mount the buis and Eotech on it or
C. Buy a stripped pistol lower and build it up, then do the Colt upper w/short barrel on it.
D. Hope I do well enough on my tax refund to keep the Colt and buy a complete pistol.

If I go with a pistol it'll be much easier to tote as a "truck gun". Also if it's a pistol it can be kept "cocked and locked" in a vehicle unlike a rifle.

The Colt is from 2008, has less than 500 rounds through it, has the "restricted" markings and I have the original box/papers/etc. Please chime in with what would you guys think would be the most economic options and if I'm overlooking something. I've got pretty thick skin so if I'm being a knucklehead for even thinking of this let me know as well.

Cheers and thanks.