I started to shoot the M1A and it wasn't bad but I found out that it takes a lot of maintenance, the mags are way too expensive and would always get stuck in the well.
A friend wanted to get into high power with an AR and I was given a good price because he was a dealer. The first time out I shot a Master score but after, that the scores kept on getting lower and lower. I think my worst was a 455. I went to the Texas State Match and after losing a hundred points[really!] off my average, the range officer told me that the reason I couldn't adjust to the 300 and 600 stages was because the rear sight had 1/3 clicks on the early Eagles. I sent the rear sight back to Armalite and they sent me the correct National Match sight base. 1/2 elevation and 1/4 windage. The next thing that my son mentioned was whether the front sight was correct. I found out that the front sight was reversed. I had the taper facing the wrong way and it was creating a shadow. It was also loose. I locked the sight using a 8/36 set screw on the bottom and I'm knocking on the door of the Master scores again. I know I can shoot, I just didn't know enough to blame the rifle.
The AR15 types are interesting. The low recoil has got to be an advantage in rapid fire. Several of the guys I shot with went up a classification when they switched from the M1A to the AR. For me with the .30 calibers, if my position is tight and natural point of aim is correct, when I come down out of recoil my front sight is at 6 oclock. Take up the slack, and let it go.
Regards
J.R.