JB Unicorn Tight Bore 6.03mm Barrel - M4 Series, 363mm (14.29in)

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  • $27.95
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The JB Unicorn Tight Bore 6.03mm Barrel - M4 Series, 363mm (14.29in) is far and away, one of our most popular items. People can't seem to get enough of it.

Inventory Last Updated: Aug 28, 2025