INTERNAL UPGRADE
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Black Python 650mm Tight Bore Barrel - PSG-1 Plus
Model#: BP650 -
Ultimate 509mm Tight Bore 6.01mm Barrel - M16 / M249 / AUG
Model#: MB-UT509 -
Madbull Penpal Silicon Oil
Model#: MB-PENPAL-OIL -
Barrel Nut Washer
Model#: MB-BNW
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Blaze Orange Nylon Fiber Piston - Full Teeth
Model#: MB-PISTON-PX02 -
X Factor Piston 02 - Full Teeth
Model#: MB-XF-P02 -
X Factor Piston 01 - Half Teeth
Model#: MB-XF-P01 -
Madbull Ultimate Spring Guide version 2
Model#: MB-ULSG-2
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Madbull Ultimate Spring Guide version 3
Model#: MB-ULSG-3 -
Ultimate 509mm Tight Bore 6.01mm Barrel - PSG-1
Model#: MB-UT650 -
Ultimate 229mm Tight Bore 6.01mm Barrel - MP5 / AK Beta
Model#: MB-UT229 -
Ultimate 363mm Tight Bore 6.01mm Barrel - M4/SR16/SG551
Model#: MB-UT363
