Well it is a lot easier to make something with this level of workmanship. Hog out the wood, put in the metal, rough shape it, rust the parts and viola a complete gun.
I can't do this "level of work".
Can you imagine an actual master allowing his apprentice to do this sort of thing? If the master was properly trained its not going to happen.
If he did he would be violating the apprentice contract to properly train the apprentice.
In America anyone could and can "build guns" and it is painfully obvious that this was the case when looking at some originals. Some of them are butt ugly and could be the product of someone who stocked muskets during the Rev War and then thought he was a gunsmith.
Dan