Black Knight M4 CNC Aluminum GBB Outer 2 Piece Barrel System 9in. and 14in. for M4 GBB Black

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The Black Knight M4 CNC Aluminum GBB Outer 2 Piece Barrel System 9in. and 14in. for M4 GBB Black is far and away, one of our most popular items. People can't seem to get enough of it.

Inventory Last Updated: Jul 22, 2026