I didn't say yours didn't I said a lot of builds never work 100%.
When I want to build a gun I want I make sure its going to function 100% with the right pick of parts I want.
When I was researching ar9s 5 years ago there wasn't a single build in the FB groups that functioned the way they wanted it to.
Most just wouldn't feed, fire or eject and had to do a lot of work to get it to actually function.
I slap a bunch of random ass ar15 556 parts together with no matching companies for any part and it works every time.
Yet someone could do the same thing and have a non functioning gun. which is what I was talking about.