Lines of Effort
Effort 22 is what the esteemed gentleman of the Commonwealth of Virginia is working on. He's building a proof of concept lower to accept a .22"LR upper. It will have no buffer tube, and only the front will be built from plastic bricks. The rear will be built from oak. Feel free to outdo him and build the rear from bricks.
The Virginian's LDRAW files. You will need LDRAW or LVIEW to view these files. Your browser may render them as text - save them, & then you can open them in LVIEW.
1st lower design
2nd lower design