The 6920 was my third favorite DI AR behind the Colt 6520 (super light KISS carbine) and BCM Hammerforged Midlength (softer shooting, longer sight radius and more ... Therotical reliablity).
I had two 6920, and am moving away from DI. I've owned tons of ARs over the past 31 years, and feel DI is poor engineering.
Now that 6.5 pound top shelf piston designs are available the whole "DI is lighter" (the only real argument in favor of a DI system) idea has been negated.
I prefer my ACR, SCAR, POF & LWRC ARs to the DI ARs.
If I had to chose one 5.56 rifle it would be either the SCAR or LWRC M6-SL with M6IC lower.