Update with Brownells today. I had a bunch of small parts ordered to complete the rifle for everything except the barrel. Received an email this afternoon stating that the triangular handguard cap and A1 buffer tube kit is considered "Significant Military Equipment" and they can't ship it, yet the A2 birdcage flashhider and crush washer are fine and are being shipped. Weird US laws. Now I need to part out the buffer kit and buy the pieces individually to get it shipped. Just can't buy the kit.