I used to own a dpms and now run a ceiner.
Both ran fine with a RR national match
Both did not run worth a darn with my jewel
When I tried a aftermarket light spring (jb?) the results were spotty (light hits)
I would like a lighter trigger but the rimfire actually takes a pretty firm smack to set it off in a reliable manner
The Rock river is of course pretty good but I would like to here of others results in this vein
My Dale Anhalt built dedicated M261 based upper works fine with either the Armalite 2 stage NM trigger or the RR tuned by Holliger.