Fits Glock 33

Glock 33-Round Magazine: OEM Factory Extended Magazine for 9mm Double-Stack Models

The Glock 33-round magazine is a factory OEM extended magazine that holds 33 rounds of 9x19mm Luger in a double-stack configuration. The 33-round magazine (Glock product designation: Magazine 33 Rd) is manufactured by Glock with a hardened steel insert encased in high-tech polymer, a high-quality coated compression spring, and a polymer follower. TactaBlue stocks the Glock 33-round extended magazine in black, olive drab green (OD), and flat dark earth (FDE) finishes with orange Gen 5 follower.

Glock 33-Round Magazine Specifications

• Caliber: 9x19mm Luger (9mm Parabellum)
• Capacity: 33 rounds
• Body material: High-tech polymer with hardened steel insert
• Feed lip material: Steel-lined with full-length steel inserts
• Spring: High-quality coated steel internal spring
• Follower: Injection-molded polymer (orange on Gen 5)
• Magazine body: Double-cut magazine body with reversed magazine catch notch
• Witness holes: Numbered witness holes for round-count verification

Glock 33-Round Magazine Compatibility

The Glock 33-round magazine is compatible with all Glock double-stack 9mm models: G17, G18, G19, G26, G34, G19X, G45, and G47. The 33-round magazine fits Gen 3, Gen 4, and Gen 5 pistols. The magazine extends approximately 5.5 inches (140 mm) below the grip on the G17 and approximately 6.5 inches (165 mm) below the grip on the compact G19. The 33-round magazine does not fit single-stack models (G43), Slimline models (G43X, G48), or non-9mm models (G23, G21).

Practical Applications

Home Defense

The 33-round magazine provides nearly double the capacity of a standard G17 17-round magazine without reloading. In a home defense scenario, the extended capacity eliminates the need for a magazine change. The increased magazine length provides additional grip surface for a two-handed hold.

Competition Shooting

The 33-round magazine is used in USPSA (United States Practical Shooting Association) and multigun competition stages that require high round counts per stage. The 33-round magazine reduces the number of reloads during competition stages. The Glock 34 competition model paired with the 33-round magazine provides 33+1 rounds before a reload.

Recreational Shooting

The 33-round magazine reduces loading frequency during range sessions. A shooter fires 33 rounds per magazine load instead of 17, which reduces the number of loading cycles by 48% per equivalent round count.

Pistol Caliber Carbine (PCC) Use

The Glock 33-round magazine is the most popular extended magazine for pistol caliber carbines (PCCs) that accept Glock magazines. Compatible PCC platforms include the KRISS Vector, Ruger PC Carbine, Kel-Tec Sub-2000, PSA AR-9, Aero Precision EPC-9, and CMMG Banshee. The 33-round capacity provides a practical magazine capacity for carbine-length platforms.

Advantages and Disadvantages

Advantages

The Glock 33-round magazine has 5 advantages: factory OEM reliability with Glock's steel-insert polymer construction, compatibility with all double-stack 9mm Glock models and 12+ PCC platforms, 33-round capacity that reduces reload frequency, numbered witness holes for visual round-count verification, and availability in 3 color options (black, OD green, FDE).

Disadvantages

The Glock 33-round magazine has 3 disadvantages: the extended length (approximately 8.5 inches total) makes concealed carry impractical, the loaded weight of approximately 16 oz (454 g) shifts the balance point below the grip, and the magazine is restricted in states with magazine capacity limits.

Aftermarket 33-Round Alternatives

Aftermarket 33-round 9mm Glock-compatible magazines are available from RWB (steel-lined polymer in black and tan), ETS Group (translucent polymer for visual round count), and SGM Tactical (polymer). The Magpul PMAG 27 GL9 provides 27 rounds as a mid-length alternative. The Magpul PMAG D-50 GL9 50-round drum magazine provides the highest capacity option. RWB also manufactures 33-round magazines in tan (FDE) finish.

State Magazine Capacity Restrictions

The Glock 33-round magazine is restricted in states with magazine capacity limits. Ten states and the District of Columbia restrict magazine capacity to 10 or 15 rounds: California (10), Colorado (15), Connecticut (10), Delaware (17), Hawaii (10), Illinois (varies by municipality), Maryland (10), Massachusetts (10), New Jersey (10), New York (10), Rhode Island (10), Vermont (15 for long guns, handguns exempt), Virginia (20+ restricted for some purchases), and Washington (10). Verify state and local legality before purchasing.

Glock 33-Round Magazine Maintenance

The Glock 33-round magazine requires spring replacement every 5,000 to 8,000 rounds due to the longer spring travel distance and higher compression ratio compared to standard 17-round magazines. The 33-round magazine spring compresses approximately 5 inches (127 mm) from fully loaded to fully compressed. Clean the magazine body and spring after every 1,000 rounds or after exposure to dirt, sand, or moisture. Use a magazine loader (Maglula UpLULA or Glock OEM loader) to reduce thumb fatigue when loading 33 rounds.

Related Products

The Glock 33-round magazine pairs with a magwell for faster reloads and a magazine coupler for back-to-back 33-round magazine configuration. Browse Glock 17 magazines, Glock 19 magazines, the full Glock magazine selection, and Glock parts and accessories at TactaBlue.