After having trouble shooting consistent groups at 15 yds, Shots went up, down and to the right by 8 inches from initial shot of two within an 1 1/2 inches of each other. I took the forend off to examine the barrel tightness and found the locking nut (103 in the instructions) loose. It was not tight up against the washer. I think it should be tight I doubt that it should be loose. The barrel is not loose. I put about 900 rounds through the gun and I do not remember ever getting a small group at 25 yds (2 inch dia) and definitely not at 50 yds. I have a red dot sight on it also but the iron sights and red dot give me the same results. I have no problem wit my ar 15 at 15 yds putting them in small group thirty rds in the same hole. Will call Kelec and ask them about it. Oh it's 40 cal.