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MAGPUL UBR COLLAPSIBLE STOCK MP MAG330
• Mounts on durable Entry Receiver Extension tube (included) to accomodate the common M4 carbine buffer and spring
• 7-Position LOP adjustability with customizable preset system for fast access to preferred length
• Solid “fixed stock” lockup in all positions
• Enhanced lock mechanism w/ integral impact buffer increases drop strength and shock reduction
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