My barrels in , a criterion 16" hybrid 223 wylde chambered, chrome bore, and place another order that has the trigger in it. Most of you guys are going to scold or rib me as I went in a different for a trigger. After setting down to think about this I ordered a RRA 2 stage NM trigger and the yellow spring kit after calling RRA and with one of there folks . I was told the yellow spring kit should work fine on 5.56 ammo and drop the trigger pull to 3 1/2lbs to 4lb max total pull weight after some shooting. More than likely I will do some polishing on it too. Everything else is in transit but a gas block and FFT. Still deciding.