Kel-Tec CP33: The 33-Round .22 Pistol Explained

The Kel-Tec CP33 is a .22 LR pistol built around a 33-round quad-stack magazine, a five-and-a-half-inch threaded barrel, and a full-length top rail for an optic. It looks like a science-fiction prop and shoots like a rimfire race gun. It's also one of the more misunderstood .22s on the market, because the magazine that makes it special is also the part that new owners get wrong. This guide is about understanding both.

One honesty note up front: Ammunition Depot's catalog lists the CP33's 33-round magazine as a product page, and we link that below. For the pistol itself, browse the handgun section, since listings rotate. Everything here comes from Kel-Tec's published specifications and owner documentation, not a range test.

What the CP33 is for

Kel-Tec designed the CP33 as a rimfire competition and plinking pistol. The long sight radius, the rail, and the 33-round capacity all point at Steel Challenge and similar rimfire action games, where a stage is five strings and a reload costs time. A single magazine covers a full stage with rounds to spare. The threaded barrel makes it a natural suppressor host where suppressors are legal, and the pistol's weight, well over a pound and a half, keeps it steady under a can.

What it is not is a carry pistol or a beginner's first .22. It's large, it has a specific loading procedure, and it rewards a shooter who reads the manual. If you want a light, simple .22 pistol, skip to the P17 section.

The quad-stack magazine, and why it jams when loaded wrong

The CP33 magazine stacks rounds four wide, which is how it fits 33 rimfire rounds in a grip-length body. Rimfire cartridges have rims, and rims can lock over one another if a round sits forward of the one below it. Kel-Tec's loading instructions are specific: each round must be pushed fully to the rear of the magazine as it's loaded, so the rims stack in order. Load it casually and you'll get a rim-lock stoppage somewhere in the stack that looks like a feeding failure and isn't the pistol's fault.

The magazine is clear-bodied, which lets you see the stack and confirm every rim is behind the one above it. Do that before every stage. A magazine loader that seats rounds rearward helps; our magazine and loader guide covers the options. Once you've loaded a few correctly, it becomes automatic.

Ammunition that runs it

Like every rimfire semi-auto, the CP33 wants high-velocity, copper-plated ammunition to cycle reliably, and it wants a clean chamber. Its heavier slide handles standard-velocity loads better than a light polymer pistol does, but subsonic ammunition under a suppressor may need testing. Our jam troubleshooting guide separates magazine problems from ammunition problems, which matters more on this pistol than most.

Mounting an optic

The full-length top rail takes any Picatinny-mounted dot, and for Steel Challenge that's a mid-size open reflex sight sitting as low as the mount allows. A micro dot like the Riton 3 Tactix MPRD is a slide-cut optic in its native form; on the CP33 it needs a Picatinny adapter plate for its footprint, so confirm what's in the box before buying. Our rimfire optics roundup covers which dots are rated for the slide-mounted use they'll see on other pistols.

The P17 alternative

Kel-Tec's other .22 pistol is the opposite design brief: the P17 is a light polymer 16+1 pistol at a much lower price, and the optics-ready version ships cut for a slide-mounted micro dot. If the CP33's appeal is "a lot of .22 rounds and a dot," the P17 delivers most of that in a pistol that fits a holster and costs much less. It gives up the sight radius, the rail, and 17 rounds per magazine. For most casual shooters that's the better trade; the CP33 is for people who know they want the race-gun shape. The .22 pistols by role roundup places both.

Competition setup

For Steel Challenge, a CP33 with a dot and two correctly loaded magazines is a complete rimfire-pistol setup. Zero the dot at 25 yards, since steel sits between 7 and 35, and practice the magazine loading procedure at home until you can see a rim-lock before it happens. Our Steel Challenge vs NRL22 guide covers the match format.

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