My DPMS LR308L came with a very good trigger.Depends how much money you want to spend.I think the Rock River National Match 2 stage at about $120 is a pretty good buy.First choice would be a Gisselle Super Semi Advanced 2 stage.I like the 2 stages .Robust sear engagement,but a nice clean breaking,light second stage.
The Armalite AR-10 has a firing pin spring .It needs a strong hammer whack and not all AR-15 assys are up to it.The DPMS does not have this feature.
Brother's AR-10 began doubling on him with the original trigger so I loaned him a Rock River.It gave good results in the Armalite so I would have confidence it would work well in the DPMS.
As far as comparing the two rifles,Armalite vs DPMS?
I like my DPMS,works good,shoots fine.Less money.But,if you can afford the Armalite,you will get what you pay for.
An imperfect comparison,I understand a Philipine Rock Island Arsenal is supposed to be a decent ,useful 1911 for about $450.
A Springfield or Colt ,what,$800,$900+?Customs and top of the line 1911/s,lots more.
Better,yes.
A man with a Rock Island still is a man with a .45 1911,