Seeking professional caliber guidance. Knights Armament SR-25 build

[crays]

Knights and DPMS pattern stuff get along just fine. Pretty much everyone other than older Armalite.

Internals and mags maybe, but KAC uppers and lowers are angled at the rear, like Armalite, not radiused like DPMS. I believe you can mount a KAC upper to a DPMS lower (pin distance is same?), but you will have an ugly gap. Buy a matched set of receivers, and you should be good.

I'm no expert by any means, but I have been doing a lot of reading and research lately because my foray into building a 308 "AR" has been bumpy. There's some good info on 308AR.com, as well.

Good luck on that $2k budget.

ETA: I started out trying to "do it on the cheap", and that bit me in the arse.