AFAIK, the patent application must disclose enough so that an average person in the art can understand how to make the same thing.
The question is, does it apply to the invention or apply to the final produce?
For example, an invention on an untested concept, while it discloses enough for those in the art to understand what and how to make the invention, but the invention is not practical, e.g. it needs other technology achievement to work, does this match the sufficiency of disclosure?
For example, let say the invention is about a zigzag gun barrel, for example to shoot through complex corner or shield. While the concept of the invention is easy to understand and make, there is no material strong enough to withstand that design, which means the invention can not be made in practice. So is this disclosure sufficient at the time it filed?