Stock buckings in KSC and KWA gas blowback platforms frequently fall victim to silicone oil swelling and cold-weather shrinkage, but the RA-Tech System 7 Hop Up Rubber provides a permanent, drop-in cure for these frustrating performance drops. Molded from a specialized, high-density rubber compound, this upgraded bucking actively resists the chemical degradation caused by green gas propellants and heavy lubricants. By establishing a remarkably tight nozzle-to-bucking interface, it seals the system to minimize pressure loss during the violent cycling phase, resulting in highly stabilized muzzle velocities. Internally, an optimized pressure patch applies uniform, perfectly balanced friction across the BB, guaranteeing reliable retention and generating the exact backspin needed for flat, predictable medium-range trajectories. Cast in a high-visibility blue, the material allows shooters to instantly spot micro-tears, premature wear, or debris accumulation during routine field stripping and maintenance. Engineered specifically to correct factory tolerance variations in pistols and submachine guns running the System 7 and NS2 architectures, this single replacement rubber delivers the exact shot-to-shot consistency your sidearm needs to perform flawlessly under pressure.
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