Found my next suppressor. I already have a CZ75 SP-07 Duty. 
I've been to many gun shows, but mainly just to browse and fingerbang guns I can't afford (handled a PS90 at the last one and fell in love with the ergos, but it's way too rich for my blood). Nowadays, there's not many deals to be had at them.
Here's the last AR I put together:
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I'm thinking of building myself an AR, how much cheaper can I build one compared to buying, say, a complete BCM rifle? The BCM I want is about $1300.
Depends. Got a link to the specific one you're looking at?
BCM is top quality. I've had many of their uppers over the years, and they all ran like butter, no matter what I fed them. In my opinion, where it really matters is the barrel and bolt carrier group (and maybe trigger, if a light pull is important to you). Everything else though, you can most likely get the same quality for cheaper. As far as standard forged lowers, if they're from a reputable company, then they're generally all the same. Sometimes, you're just paying a premium for the roll mark.
My advice is to buy a stripped lower of any reputable brand (which will be hard right now, given the political climate and all the "panic buying" going on) and a lower parts kit of your choice and put it all together yourself. Then buy a complete BCM upper, and just slap it on there. You'll absolutely save some money.
I've assembled many stripped lowers, but I've never assembled an upper from parts yet.
Looks like lowers are the hard ones to find so far in my limited search. Thinking about one of these $439 uppers from BCM.