The last time someone tried that stunt in Texas he had his head blown off, literally.
Funny thing about that deal in Texas though. The church did have a security team in place and one of them did in fact take the killer out with one round from his .357 SIG, but you know what?
That killer walked right thru that security team into the sanctuary, wearing an overcoat on a hot summer day, with a shotgun concealed under it.
“Oh, Mister Smith, nice to see you today, here, you don’t mind if we all just kinda hold you up right here and help you with your coat...”
Good thing that Plan B worked out for them but Plan A would have been better.