Are we playing the same game? Do you understand max stats? 4 centurion arms and a 195 dex mag will still not change the fact that HUnewearl's ATA caps out at 209, instead of 210 (The requirement for last swan). Male HUs ALREADY GET PSYCHO RAVENS, THE OP GUN ALREADY EXISTS, we're asking for a balanced alternative for female characters, including rangers, to keep them relevant.
Hunewearl has the lowest ATP of any HU. Therefore, allowing them to use decent mechguns, with lower ATP than Pyscho Ravens, with a lower class ATP than any other HU, but you're telling me that this weapon idea is broken...
Someone mentioned that "oh but Last Swan is easy to get..."
The item that is difficult to obtain would be Psycho Black Crystal or equivalent event item, not the original gun you were transforming.
I think this weapon is a great idea.