There is nothing wrong with a Delton or a DPMS. Both weapons will stand up to casual shooting. My brother sends a 500 round box of cheap 5.56 ammo each time my niece comes out. She manages to shoot it all in a week, along with 550 22LR rounds. I have two DPMS.
When I shoot DPMS or a Delton all I shoot are golf balls. I run out of grass before the golf ball is out of range. I know golf balls aren't the same as punching paper. Golf balls are harder to hit than paper. Most of the time I am guessing where the center of the golf ball is located. The grass covers all but the top of the golf ball.