He states this for the C-Tier guns, which I have no problem with...
"If you need to cut costs, this is how you do it. I’d trust these to defend myself with, but only after I took it to the range and ran 500 rounds through it to make sure everything really works."
So you gotta put $500 worth of ammunition through it to make sure it works.
Sounds a lot like breaking in a 1911 with a thousand rounds before it runs right.