Took my new RDB out for its first range day! Mucho fun!! First impressions are as follows.. The night before, I took it apart, cleaned, lubed & ran a bore snake through it. Then off to my local indoor range the next day. No optics yet, so I used a set of Magpul plastic flip up sights at 25 yards using Federal 55 gr 5.56 FMJ out of the green ammo can. That pup is a lot of fun! I noticed the cases were coming out with bent necks & after about 20 rounds I had a FTF. Live cartridge ejected with a bent neck & mashed bullet, so I went 1 click lighter on the gas setting. Spent casings looked much better, but still slightly bent rolling on the workbench. Went 1 more click lighter, now the spent brass looks perfect. Overall, shot about 90 rounds with nice groups @ 25 yards. Zero issues after the gas adjustment. Mags & mag release worked flawless. Amazing trigger. Can't wait till next week!