My FFL got out of the marines a year ago and then started gunsmithing school. He builds custom AR's for people and really knows his stuff. FWIW he told me to never mess with the trigger on an AR and I went with his advice. Instead, when I bought AR's for my son and I the first thing I did was purchase Timney triggers for them. They are fantastic. The cost of the triggers has delayed purchasing optics but I think it was well worth it. If you want to purchase another stock trigger I have two DPMS triggers and will sell you one.
I comprehend how a projectile can, “lose velocity", but don't understand how a projectile can, "loose velocity".