Post number 2 , 21 degree full head have porter cable and other brands for what you are doing harbor frieght and yes I have 2 of there brand , roofing nailer runs without a hitch hitachi , milwaukee ,bostich and rigid , all had issues , funny I like name brand to but when the cheapo chinese oh wait they are all made there now .
And to the hammer and nail , well I was a holdout to for a long time but when the air tools make a job so much faster and easier and do so much for a one man show ,.