Re: Slash Heavy Buffer
The Tubbs' carrier weight system is meant to delay the bolt from unlocking as quickly. I have it in my Armalite but can't say I noticed any difference in accuracy.
I also run a Tubbs .308 flat wire spring with Slash CAR-10 buffer. I know it isn't recommended by Slash, but it works well. It did change the recoil, almost seemed like you felt two impulses rather than one. You get the rifle's recoil, then you would feel the carrier.
I put on a PWS PRC brake and there is no recoil at all now, but it is LOUD.
AFAIK, the real reason for going with one of Slash' buffers is to use any AR-15 collapsible stock with a .308 AR. I don't know about DPMS but if you get a carbine AR-10, you shouldn't just use the buffer it comes with if you change out the stock.