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Threaded for your 5.56mm carbine.
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Machined from 4150 steel.
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Phosphate coated per MIL-STD-171.
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Predrilled hole at the base for permanent installation.
When mounted per BATF specifications for a permanent installation it will bring your 14.5″ M4 barrel to a non-NFA length of over 16.1″.
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