Gas Blowback Rifle (GBBR) Inner Barrels

Gas blowback rifle barrels use a GBB-style cut but are strongly platform-specific: the Tokyo Marui MWS, WE, GHK and VFC systems each differ in length and mounting, so there is no single GBBR interchange pool. Most M4-pattern GBBRs (TM MWS, WE, GHK) run around 370mm, while shorter carbines and longer rifles vary widely. Always identify your exact system before buying, and match the barrel to that platform rather than to another gas rifle.

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