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These bore-up cylinders actually have the same external dimensions as a stock cylinder so they will fit into a standard gearbox
"What is Match Grade BB
Metal Receiver With Top Cover
Madbull Non-Linear Spring
smoother air flow & increase overall performance Power Output may vary if used in conjunction with our upgrade parts
PDI 01 6.01mm Precision Barrel for Marui M4A1 MWS GBB (250mm) QD Sling Mount These bore-up cylinders actually havePDI barrels are cold hammer forged from stainless steel, which is the same process how real rifle barrels are produced. They have a superior tolerance and roundness of the inner surface compared to anything else on the market. PDI 01 6. 01mm Precision Barrel for Marui M4A1 MWS GBB (250mm) Stainless Steel Tightbore Upgrade Barrel Internal diameter 6. 01mm built for precision shooting Genuine Products by PDI Advance Technology forming by Cold Forging on
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