Hello @mars_ghoul, welcome back to the forum and thank you for your post.
We are not currently not planning to provide additional updates to Assassin’s Creed III Remastered.
This means, even though your issue was highlighted and fed back to the AC team originally, then reviewed again, it will most likely not be addressed and remain in the game.
I apologize for any inconvenience this pistol bug may have caused you, I hope you will still continue to enjoy the game regardless of this glitch.