I have an 11.5 Sionics RGP and it works great with a Silencerco Specwar 556k on the end. Also have a Triarc 11.5 Track 2.0, not sure it is suppressed only got it off PA, it won't cycle Wolf or Tula without a suppressor, suppressed it will. Cycled full 5.56 brass without the suppressor with no issue. 223 will cycle with the suppressor, wears a Silencerco Specwar 556, function seems to be good, haven't really run it hard, but seems good. I like both barrels so far. I do like that the Sionic RGP is chrome-lined.