For 600 I'd want to know what trigger. The lowers are worth around 100 bucks these days, parts kit around maybe 75 or so. Then add that fancy stock, and the fancy trigger... and the rest of the parts to get there.
Used to be standard RRA lowers with 2 stage triggers were around 225. I don't think you'll find that anymore but its what it was.
OTOH you can't really go wrong with that other than possibly the pricing.
