The Umarex Beretta PMX GBB spare gas magazine is an essential accessory engineered to extend firing autonomy and ensure tactical continuity on the field for the modern airsoft submachine gun. Produced under official Beretta license, this magazine accurately replicates the weight, dimensions, and rugged feel of the real firearm counterpart, guaranteeing a perfect mechanical fit within the magwell. Developed in cooperation with KWA, this component is purpose-built for the Gas Blowback (GBB) platform, providing superior structural durability to withstand high-stress reload drops while maximizing internal Green Gas pressure stability. The internal gas reservoir features high-flow valves with upgraded o-ring seals that eliminate leakage risks and effectively counteract the cool-down effect during sustained full-auto firing sequences. The double-stack follower design ensures smooth and constant BB feeding into the hop-up chamber, preventing jams and optimizing the bolt cycling action.

Technical and structural specifications:

Manufacturer brand: Umarex / Beretta (Official License)

Product item code: 2.6516.1

Exact compatibility: Beretta PMX GBB Airsoft SMG (KWA system / 6mm caliber)

Power source: Airsoft Green Gas

Magazine capacity: 48 rounds (6mm caliber BBs)

Loading configuration: Double-stack track with high-slick follower

Primary material: Heavy-duty metal alloy body with matte black anti-abrasion finish

Valve setup: Recessed bottom inlet fill valve and high-flow reinforced output valve

Unloaded weight: 540 g

Package content: The retail pack includes one original Umarex 48-round metal gas magazine for the Beretta PMX GBB airsoft submachine gun, safely sealed in manufacturer packaging.

Usage and maintenance instructions: To load BBs, depress the follower spring and insert 6mm BBs from the top feed lips using an airsoft speedloader. To fill with gas, invert the magazine and press the nozzle of your Green Gas canister firmly into the bottom inlet valve for 7 to 8 seconds, ensuring the canister remains perfectly vertical to allow proper liquid propellant transfer. To safeguard internal o-ring integrity, never store the magazine completely dry; always leave a small residual amount of gas inside to keep seals under light pressure and prevent drying out. Periodically apply a few drops of pure silicone oil directly onto both the inlet and outlet valves before long-term storage.

Safety warnings, product integrity, and legal notice: This product is a dedicated accessory designed exclusively for non-lethal 6mm airsoft replicas. In strict accordance with local safety standards, toy safety legislation, and European GPSR compliance guidelines, purchasing and operating this accessory is strictly restricted to individuals aged 16 and older. The internal reservoir contains highly pressurized gas: do not expose the magazine to direct heat sources, open flames, or ambient temperatures exceeding 50 °C to prevent catastrophic valve failure. Any tampering, structural alteration, or unauthorized modifications to the gas reservoir will void the manufacturer’s warranty and compromise safe handling.