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[BjornF16]

To stay clear, stay away from pistol lowers and uppers with barrels under 16''.

Right?

A pistol lower can have shorter than 16" barrels (from a federal, legal perspective). Some states/localities ban them or place other restrictions on barrel lengths. In Texas, you are good to go.

Depending upon caliber, there may be practical limitations on barrel length for reliability. AA sells Grendel uppers at 10.5". I've seen 5.56 with 7" barrel on up. I have a Noveske 300 BLK 10" upper currently on my pistol lower (waiting on SBR stamp now for 5 months).

Once the SBR stamp comes in, I'll purchase/build a 10.5 or 11.5" 5.56 upper for my pistol lower and probably spring for another can for that one.

AR-15s are way too cool!