STK M-LOK 10" Free Float Handguard for M Series Specification: - Barrel Nut inside diameter : 1.02'' (26 mm) - Barrel Nut outside diameter : 1.35'' (34.4 mm ) - Barrel Nut Thread Spec.: 1-1/4-18 UNC - Super Slim M-LOK Handguard Rail - Length: 10" - Colour: Black Anodized
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