The VISM telescopic adaptor is made of reinforced polymer which makes it extremely lightweight yet very durable.  The tube is commercial spec diameter which allows the user to install a variety of collapsible 5 position AR stock on their rifles.  It is easily mountable with it two QD tactical sling mounts.

Why buy this grip?

• Works with VG shotgun grip and stock adapters
• Commercial Spec stock tube adapter works with a variety of AR style Commercial Spec collapsible stocks
• 5 separate positions for AR style collapsible stocks, for optimal length-of-pull adjustment
• Constructed from durable fiberglass reinforced polymer composite and a steel insert
• Lighter and more durable than aluminum equivalents

Why not?

• Fits VISM DLG Pistol Grip Stock Adapters for Mossberg 500 / Remington 870; might not be compatible with some models.
• Made of reinforced Polymer