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The KelTec CP33 (often referred to in queries as C933) is a .22LR semi-automatic pistol designed for high-capacity plinking and competition, featuring a unique quad-stack magazine holding 33+1 rounds. It has a 5.5-inch threaded barrel ( TPI), a 10.6-inch overall length, and weighs roughly 1.5 lbs. 
KelTec +4
Key Technical Specifications & Features:
Action: Blowback, semi-automatic.
Caliber:  Long Rifle ().
Magazine Capacity: 33+1 rounds (flush-fit); 50-round extensions are available.
Barrel Length: 5.5 inches.
Overall Length/Height/Width: .
Weight:  () unloaded.
Trigger Pull: .
Sights/Optics: Adjustable fiber optic sights with a 9-inch sight radius; top Picatinny rail.
Safety: Ambidextrous manual thumb safety. 
www.handgunsmag.com +6
Key Takeaways:
Design: Known for its "quad stack" magazine design, which allows high capacity in a flush fit.
Handling: Features a non-reciprocating charging handle similar to an AR-15.
Versatility: Considered a strong suppressor host, with a threaded barrel standard.
Drawback: Users often report that loading the specialized quad-stack magazine is difficult.