Kel-Tec CP33
The Kel-Tec CP33 is one of the most unconventional .22 LR pistols on the market, and that’s entirely the point. A 33-round quad-stack magazine, a 5.5” threaded barrel optimized for suppressor use, a built-in top rail for optics, and a weight of just 3.4 lbs loaded — the CP33 was designed for shooters who want maximum .22 capacity in a pistol format for competition, training, or suppressed recreational shooting. There’s nothing else quite like it at any price point.
Read our full Kel-Tec CP33 Buying Guide ↓
The Quad-Stack Magazine: 33 Rounds of .22 LR
The CP33’s defining feature is its quad-stack magazine — four columns of .22 LR that taper to a single feed point, delivering 33 rounds in a magazine that’s remarkably compact for its capacity. Loading takes some practice; Kel-Tec includes a loading tool that makes the process manageable once you develop a rhythm. For competitive shooting formats where round count matters, for suppressed range sessions where reloading interrupts the fun, or for training drills that require extended strings of fire, the 33-round capacity changes what’s possible with a .22 pistol.
Built for Suppressor Use
The CP33 ships with a threaded barrel as standard — a strong signal about its intended use. The 5.5” barrel provides a longer sound path for gas expansion before it exits the muzzle, which means it runs quieter than a shorter-barreled .22 even before a suppressor is installed. With a quality .22 suppressor, the CP33 becomes genuinely hearing-safe with standard velocity ammunition. The gun’s closed-bolt, blowback design cycles reliably with the reduced back-pressure of suppressed fire — an important consideration since many semi-auto .22s are finicky when suppressed.
Competition and Training Applications
The CP33 has developed a following in Steel Challenge and other rimfire pistol competition formats where its capacity, light trigger, and optics rail give it a genuine competitive advantage. Mounted with a micro red dot, it’s fast and accurate on small steel targets. For firearms training, the CP33’s low recoil and high capacity let shooters run trigger control and target transition drills at a fraction of the cost of centerfire practice. Many instructors use .22 platforms specifically for high-round-count skill work, and the CP33’s 33-round magazine reduces reload interruptions in those sessions.
Reliability Considerations
.22 LR semi-autos are inherently more ammunition-sensitive than centerfire pistols, and the CP33 is no exception. It runs most reliably with high-velocity .22 LR — CCI Mini-Mag and similar loads cycle it most consistently. Standard velocity and bulk-pack ammunition can produce occasional failures to cycle, particularly when the gun is dirty. This is normal for the platform and the cartridge; .22 semi-autos generally require more frequent cleaning than centerfire guns and reward shooters who use quality ammunition. Once dialed in with the right ammo, the CP33 is a reliable and entertaining range companion.
How It Compares to the Ruger Mark IV and S&W M&P 15-22
The CP33’s closest competitors are the Ruger Mark IV pistol and the S&W M&P 15-22, though they serve slightly different purposes. The Ruger Mark IV is a more traditional .22 pistol with a better reputation for reliability but a 10-round magazine. The M&P 15-22 is a rifle, not a pistol, with AR-15 controls — a different tool entirely. The CP33 wins on capacity and suppressor-ready design; the Ruger wins on reliability and simpler operation. For shooters who specifically want suppressed high-capacity .22 fun, the CP33 has no real peer.
Related Pages at Impact Guns
See all Kel-Tec firearms including the Sub-2000 and CMR-30. For .22 comparisons see the Ruger Mark IV and S&W M&P 15-22. For rimfire ammunition see our .22 LR ammo page.