Pic of the build, finally.
I got this upper from CBC. I'm a little worried about buying "budget", but it's performed great so far. I ordered an upper parts kit plus a blemished upper for about $70. Instead, in the box, I found the blemished upper PLUS another fully-assembled upper (ostensibly with the upper parts that I had actually paid for). Also got a muzzle washer and 1/2x28 thread protector. This is a California Featureless build.
I picked up some keymod 15" free float handguard; can't remember where from. Paid $20 ish
Barrel is an 18" 223 Wylde from Green Mountain. Specifically the M49. $210 I would've preferred a 20", but oh well.
I already had the assembly tools and chemicals, except for a 30mm wrench that I "borrowed" from Lowes.
So for right around $300, I feel like I did alright.
Here she is... and since I'm always yapping about 300 Blackout, here's my upper for that. The 300 Blackout is my home defense, and I keep it loaded with Lehigh 115gr controlled chaos.
The California specific parts are aforementioned muzzle-thread protector, the grip from Resurgent Arms, and the Stock Stop which fixes the stock. In this configuration, my AR is 100% California legal, even with the 40rd magazine I got during "Freedom Week". Everything else is basically Milspec, except the Rave 140 trigger.