We only fitted the machine screw type swivel studs with nut on stocks with aluminium plate internally in the forearm of the stock. Most Hunter type stocks just have a 3/4" wood screw type swivel stud screw into reinforced resin and fixed with green Loctite. They will open with some force. We did this because I would be annoyed of any loose swivel studs on a stock. A small 5mm fixture like a swivel stud will always have difficulty holding a bipod like a larger Harris which might twist it loose.
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