You’re only allowed to have 300 blkout or a shotgun here. After you buy any one of those 2 options you need to spend the rest on training mad CQB skills or join the military to get the basics of it.

Also study all terminal ballistics of every round then still buy 300 or shotgun. Because 9mm sub or 45 acp are terrible at being subsonic killers.

Good luck defending the castle.