Beretta 391 Stock Bolt Tube Plug

• Genuine Beretta spare part: the stock bolt tube plug for the 391 semi-auto shotgun
• Threaded cap that screws into the rear of the stock bolt tube inside the buttstock
• Retains the recoil spring assembly and gives the stock bolt nut and washer a seat to tighten against
• Same stock bolt tube design is shared across Beretta's 390, 391 and 3901 range
• The correct replacement if the original plug is lost, damaged or has worn threads during a stock strip-down

This is Beretta's own stock bolt tube plug for the 391 semi-auto shotgun — a small but essential piece of hardware that holds the buttstock onto the receiver. It is the threaded cap that screws into the rear of the stock bolt tube inside the buttstock, retaining the recoil spring assembly and giving the stock bolt nut and washer something to tighten against as they clamp the stock in place. Beretta shares the same stock bolt tube design across the 390, 391 and 3901 family, so this plug is a common casualty during a stock strip-down, particularly if the original was removed without care or the threads have worn from repeated servicing. Fitting a genuine replacement rather than an improvised washer keeps the recoil system correctly seated and the stock properly tensioned, which matters for both handling and safety on a semi-auto action. As with the original factory fitment, a smear of thread-locking compound on refitting will stop the plug working loose under recoil.

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