Damage rating is from low ATP to high ATP and not rounded up
All weapons are 7 stars, GRM is used in all cases except those Maple Story Mesos in which it does not produce a specific weapon type or when that weapon type is a Claire weapon. This is due to the fact that GRM weapons tend to have average stats.
So definitely take this one with a grain of salt as not all of the weapons are from the same manufacturer due to availability. Damage rating is from low ATP to high ATP and not rounded up.
These are the final rankings of each weapon. They are derived from the average of their previous scores. One must remember I did not round up and such.
Therefore, these results especially, must be taken with a heaping pile of salt. These are not weapon tiers and do not reflect the true usefulness of said weapons. Results are rounded to the first decimal place.
In the first screenshot below, Ethan receives his Item Synthesis kit from Lumia. Ethan puts this kit to use in the second screenshot. He is seen trying to perform a 4 slot synthesis involving a Twin Power Gun, Imu Photon, Keleserin, Hapotite, and Bal Epon.
The chances of success are 64%. PETE is quoted as saying, "If I fail at this synthesis, please do not be angry with me."