JBU AK-Beta M120 Upgrade Kit



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The JBU AK-Beta M120 upgrade kit contains all the parts needed to upgrade your AK-Beta to a M120 spring. The air seal upgrade parts included ensure better compression in order to utilize the upgrade spring's energy. This upgrade kit includes a metal spring guide with ball bearings, M120 Spring, aluminum piston, ported piston head with ball bearings, metal cylinder head, smooth bore cylinder, and metal air seal nozzle.