Well, remember that my friend was shooting full auto with lead bullets at about 1,200 RPM. In a 14.5" barrel this leads up very quickly. Shooting semiauto should present a much lesser risk.
In any event, I went to a 7.5" barrel "Kitty Kat" upper, removed and plugged the gas tube and polished the entire insides. I also try to shoot only CCI minimags, which are plated, in the upper. With all these tweeks the upper runs 99% with a Ciener F/A kit. A blast to shoot all day very cheaply!!
|