Right.But that's not what the issue is. The issue is the jury wondering why you needed to make your own and why store bought wasn't good enough for you and your having to explain yourself. The less to explain, the better.
And as long as you have a reasonable explanation (I handload factory components to recommended specs in order to increase my confidence in my ability to hit what I am aiming at and not kill innocent bystanders) then there is no issue there.
Personally I think the tendency to carry "high capacity" pistols with multiple magazines and dress like a ninja looks a lot worse. But no one has ever been convicted on poor taste.