Another difference with custom made guns is the manufacturer measures the shooter to correctly fit the shooter. They then adjust the stock for length, cast off and drop. This allows the shooter to mount the gun the same way every time so it naturally points at the target.
Having said that, one could much the same by adjusting the stock to at least fit the shooter better.
montveil in the NC mountains
All persons present in uniform should render the military salute. Members of the armed forces and veterans who are present but not in uniform may render the military salute. All other persons present should face the flag and stand at attention with their right hand over the heart, or if applicable, remove their headdress with their right hand and hold it at the left shoulder, the hand being over the heart.