They COULD be called riflemen and/or riflewomen- but most are simply called shooters.
Repeaters
Repeaters
Better than 90% of the people who shoot them.
Yes
No
DO NOT SHOOT AMMUNITION IN A WEAPON NOT CHAMBERED FOR IT. If you do, bad things will happen.
Shooters or Gunners
jobless
The 5.56/.223 Remington rifles can be. Other calibres cannot be, unless the upper is replaced.
There called C02 air rifles or PCP air rifles
Pretty much any bolt action.
Needs to be examined by a gunsmith.