I couldn't tell but these are stripped lowers correct?
You can get Plum Crazy complete lowers for ~$105 each. These are all composite and are driving the BATFEIOEIO up the wall.
How are they driving the ATF crazy?
I have a PC lower for my .22 AR, bought it complete with buttstock and LPK installed for $125 at a local gun store. Same purchase (in order to deliberately buy 2 AR receivers during the "4 border States have to report all multiple rifle sales" bullscat), I bought a Sun Devil stripped lower for $100.
Yeah, a PC can become a sub $600 AR... but I'm not exactly crazy about the quality of it. Note that it's on my .22 rig, not my centerfire rig. They ain't exactly anything to write home about, and I have a suspicion that even the LPK parts are made of plastic.