I had a question about the Smith and Wesson M&P Sport II 5.56mm. My only other experience with AR-15 type weapons was long ago in the Military, about 25 years ago. It seems my friend's new Smith and Wesson AR-15 has a slight delay in the trigger reset. In the old Military version it seems you could pull the trigger as fast as you wanted to on semi-auto but not with a newer version or at least this particular rifle. Is this normal?