I've been "attempting" to build one for about 2 months now. So far the only parts I actually have is a mil-spec stock I bought on here and a lower parts kit . I have 3 lower receivers on order that were "in stock" at the time I ordered them...The supplies seem to be increasing some, but you have to be real quick on ordering them..on several companies "notify" list, but even if I am right on it, they are always sold by the time I get on the site. I have noticed prices slowly coming down on complete rifles, so much so that I just bought a NIB Bushmaster (non-carbon) model w/2 P-mags and hard case for $899. That's real close to pre-panic prices. Also, by the time you buy the specialized parts & tools you need to properly assemble it, plus paying FFL fees on every lower receiver you buy, you are prob ahead to find a good used one or get lucky like I did and stumble on to a good buy....Saw a NIB 300 whisper online for $850 but cant get the seller to respond to my emails so it is prob phony ad or he has sold it and too lazy to remove the listing.....my 2c worth...more coffee please