It's been a really long time.
As previously announced, there has been no update since I was taking the test.
Unfortunately, the test failed by a few questions.

This patch has a number of parts that can change the directional of the rifle.
(Gatling, Quad Barrel, etc.)
Also physical effects of shells and throwbacks,
reload sounds, and compatibility indications between parts
I've finished all sorts of course
Rather than listening to the explanation, I recommend you try it yourself.
There are many experimental parts, so sometimes fatal bugs can occur
I will try to fix it as soon as possible.