I've been looking into GBBR's a lot more recently...and trolling through
Gas Guns Info forum
I'm sure a lot of you know about this site already, but if you're interested in WA/WE/AGM or any other GBBR...it's worth reading through their forum. TONS of good info there.
And specifically in re. to "I'll buy a cheap AGM and upgraded it with good parts...a la Kraken clean up...and then I'll end up with the same thing but save a bunch of money"...I highly doubt it...and it seems entirely likely that until you spend significant time/money/effort fixing it up, all you'll be left with is a half broken gun.
Cheers,
Tys