SPECIFICATION:
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<br />7''/9''/10''/12''/13.5''/15''  available with .750 block
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<br />Monolithic top rail for Lights Lasers Bipods Grips Sights
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<br />Keymod cutouts for easy install of your favorite accessories
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<br />Hardcoat Anodized-Aluminum Construction
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<br />Quick & Easy Installation.
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<br />Retaining ring hole inside diameter: 1 in (25.4mm)
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<br />Retaining ring outside diameter: 1.35 in (34.5 mm)
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<br />Retaining ring thread spec.: 1-1/4-18 UNC
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<br />Package including:
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<br />1 x handguard + .75 port block with Roll Pin