I'm far from an expert but I enjoy shooting and go to the range regularly. As a gun enthusiast, I don't like seeing easily avoidable gun mistakes in the crime novels I read.

Suppressors, for example, are not used with revolvers because they require the closed chamber of a semi-automatic to muffle the noise of the shot. You'll note the device is not called a "silencer" except in Hollywood. That's because they suppress but do not silence. Check YouTube if you'd like to hear the sound they actually make. It may surprise you. I liken it to the noise of a screen door slamming.

Modern revolvers do not have external safeties which can be clicked on and off. Some semi-automatics do. The Beretta 92F is one of them. If one of your characters needs to manipulate a safety, I suggest you Google the make of weapon he or she will be using or, better yet, go to a gun store and ask if that weapon has a safety that can be manipulated.

Revolvers are no longer commonly issued to U.S. law enforcement officers. That said, check with the police department you're writing about; they may be the exception. Semi-automatics have a larger magazine capacity, often fifteen or more rounds compared to the six chambered in revolvers.

Where do police officers carry their weapons? While the agents on shows like NCIS-LA and NCIS-New Orleans whip guns from holsters at the back of their belts, the most common spot for real cops is on the belt on the officer's strongest side. Some officers carry two guns: for example one on their strong side, one in a shoulder holster on the opposite side. Backup weapons can also be carried in a pocket or an ankle holster, though I've found ankle holsters unwieldy when running.

As always, if you have gun questions, the best way to get answers is to ask the experts whether they be at a gun store or a police department. Whatever you do, don't depend on what you see on TV. Researching fiction by watching fiction . . . never a good idea.