Custom Machined to fit 3/4 barrel, 300 Black Out, 7.62x39, 308 with 3/4 OD Barrel. These are not the Standard .812 OD. If your 5/8-24 Crush Washers overlap, these are the ones for your Barrel. CNC Machined, Mil Spec Tolerances, Parkerized. Made in the USA by Xtreme Precision LLC. UPC:619159946741 from Xtreme Precision (Product 772)

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