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MadBull 6.01mm x 363mm Tightbore Inner Barrel

£36.99 inc. VAT

6.01mm precision tight bore 363mm aircraft alloy inner barrel for M4/SIG551/XM/249Pa with hard anodized coating and titanium colour finish.

The bore of this barrel is so tight around the BB that even the smallest obstruction in the barrel will cause a jam when fired, however this also provides an unparalleled quality of tight bore barrel not seen from any other brands.  This barrel is really recommended for more advanced/experienced players that take the responsibility to clean their barrels regularly in order to avoid jams.

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SKU: CBXE16T4 Category:



Additional information

Weight 1 kg
Barrel Bore (mm)


Inner Barrel Length



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