I've been asked, "I only have X type of gun. Can I shoot in Steel Challenge?". If it's practically ANY handgun or rifle that shoots a handgun caliber, then yes, there's a division for you!
Let's start by talking about Divisions.
What does division mean? It's a way to ensure competitors are apples-to-apples, hardware-wise. It keeps a revolver shooter from competing directly with a semi-auto pistol, or a rimfire rifle. The divisions are as follows:
CO - Carry Optics This basically means an everyday carry pistol that may have a low-profile red dot on it.
ISR - Iron Sight Revolver A centerfire revolver with no special optical sights.
LTD - Limited For iron-sighted "race guns" with limited modifications
OPN - Open Full-on race pistols with red dots and compensators
OSR - Optical Sight Revolver This is for the same revolver mentioned in ISR, but with a red dot or other types of optical aiming device.
PCCI - Pistol Caliber Carbine Iron sights For carbine rifles chambered in pistol calibers
PCCO - Pistol Caliber Carbine Open Same as PCCI, but now you're allowed optics and compensators
PROD - Production This is where most double-action or striker-fired semi-auto centerfire handguns fall. Note this will be for guns that are NOT single action like a 1911; those go in the Single Stack division.
RFPI - Rimfire Pistol Iron Here's your .22LR pistols with iron sights. Don't even need a holster, but I recommend having more than a couple of magazines!
RFPO - Rimfire Pistol Open Same as above, but allows optical sights and compensators.
RFRI - Rimfire Rifle Iron Sights .22LR rifles, such as Ruger's 10/22, are the most popular choice.
RFRO - Rimfire Rifle Open - Same as above, but with optical sights and compensators allowed.
SS - Single Stack This is a category custom-made for single-action only, single-stack magazine 1911s.
So you see, there's plenty of divisions you can shoot in!