I took the GHM-9 to the range today. 150 rounds fired with no failures of any kind, using Federal aluminum case bulk ammo. Can easily put 5 rounds into a 1" group at 18 yards. The front hand guard and hand stop worked much better than I expected, and there were no issues with the reciprocating bolt and my left thumb even though they are quite close. The only uncomfortable issue for me was the safety lever on the right side that rubs against the first knuckle of my trigger finger - I either need a non ambidextrous safety lever or I need to file down the sharp edge of the lever on the right side. I am also going to try switching the pistol grip to the Magpul MOE-K version to see if the more upright angle will help.